Vhf uhf antennas: UHF/VHF TV Antennas for Digital HDTV

UHF/VHF TV Antennas for Digital HDTV

Over-the-air channels are divided into two bands, UHF and VHF.  High-VHF signals are broadcast on channels 7 to 13 and UHF signals are broadcast on channels 14 to 69. Our UHF/VHF HDTV antennas represent a breakthrough in long-range performance. They are engineered to be smaller and more powerful across today’s DTV spectrum, with dedicated UHF and VHF multi-directional elements that deliver range and reception in less-than-ideal locations. To find out where your local towers are and which antenna will work best for you, enter your address on our Transmitter Locator page, or call the Connection Crew: 1-877-825-5572.

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  • On Sale!

    ClearStream 1MAX UHF VHF Indoor Outdoor HDTV Antenna

    Range: 40+ Miles

    The ClearStream 1MAX indoor/outdoor antenna has a 40+ mile range and provides crystal-clear TV signal reception in HD right out of the box. With virtually no assembly required, this antenna has a unique, integrated diplexer for reliable,…

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    ClearStream FLEX Amplified UHF VHF Indoor HDTV Antenna

    Range: 50+ Miles

    The ultra-thin ClearStream FLEX amplified HDTV antenna is our signature patented loop paired with a Hi-VHF element to enhance UHF and VHF signal reception. Engineered to reach the core-DTV frequencies broadcast in North America, you will receive the…

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    ClearStream VIEW Wall Frame Amplified Indoor HDTV Antenna with Collage Mat

    Range: 50+ Miles

    Create your very own wall of memories! This antenna is perfect for anyone who wants to conceal an antenna in their living area. Our beautifully crafted wall frame tastefully integrates a powerful, unique element for reliable, multi-directional UHF and…

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    Antennas Direct Element Unidirectional UHF VHF Attic Outdoor HDTV Antenna

    Range: 60+ Miles

    The Antennas Direct ELEMENT TV antenna receives UHF and Hi-VHF broadcast signals from 60+ miles away, a step ahead of our traditional Yagis which offer UHF-only reception. Uni-directional antennas are ideal for use in areas where the TV towers are…

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  • ClearStream HORIZON Amplified Indoor HDTV Antenna

    Range: 60+ Miles

    NEW! The ClearStream Horizon Indoor HDTV antenna is designed with simplicity in mind and features the same commitment to quality found in our industry-leading outdoor antennas. Install this elegant, discreet antenna like a sound bar, either mounted on a…

  • ClearStream MAX-V UHF VHF Indoor Outdoor HDTV Antenna

    Range: 60+ Miles

    With our quick-connect assembly, the ClearStream MAX-V antenna is easy to install and customize to your own antenna experience. Our new, exclusive steel wall bracket allows for mounting on a wall both indoors and outdoors. The included adjustable. ..

  • ClearStream 1MAX UHF VHF Indoor Outdoor HDTV Antenna with 20-inch Mast

    Range: 40+ Miles

    The ClearStream 1MAX indoor/outdoor antenna has a 40+ mile range and includes a 20-inch mast for easy installation. Enjoy crystal-clear TV signal reception in HD right out of the box thanks to this antenna’s unique, integrated diplexer for reliable,…

  • ClearStream MAX-XR UHF VHF Indoor Outdoor HDTV Antenna with 20-inch Mast

    Range: 60+ Miles

    The ClearStream MAX-XR indoor / outdoor HDTV antenna is powerful, versatile, and uses two of our patented loops to receive TV signals 60+ miles from broadcast towers. This antenna requires minimal assembly and includes a 20-inch mast for easy…

  • ClearStream MAX-V PRO Indoor Outdoor UHF VHF HDTV Antenna

    Range: 70+ Miles

    With our quick-connect assembly, the new ClearStream MAX-V PRO antenna is easy to install and customize to your own antenna experience. Our new, exclusive steel wall bracket allows for mounting on a wall both indoors and outdoors. The included adjustable…

  • On Sale!

    ClearStream 5 Hi-VHF UHF Attic Outdoor HDTV Antenna

    Range: 65+ Miles

    This antenna represents a breakthrough in Hi-VHF antenna performance. With its uniquely tuned element and integrated diplexer, it takes on the challenge of reliable long-range, multi-directional Hi-VHF signal reception in suburban and rural areas with…

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  • ClearStream 4MAX UHF VHF Indoor Outdoor HDTV Antenna with 20-inch Mast

    Range: 70+ Miles

    Crystal-clear, long-range high-definition TV signals right out of the box! With quick-connect assembly, this antenna receives multi-directional UHF and Hi-VHF reception from the front and back of the antenna. Powerful performance to receive more TV…

VHF/UHF Mobile Vertical Antennas | DX Engineering


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VHF antenna

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144 MHz

3. Superantenna 4.35 m long – 5700 rubles.

4. Modified model “Siberian variant” 11 elements 5.8 m long – 6100 rub

5. Superantenna 7 m long – 6750 rub

6. Superantenna 8 m long – 6900 rub

It is possible to manufacture adders at 144 MHz and 432 MHz for 2 and 4 antennas.

Download photo of VHF antenna units.

Dipole antenna for 144 – 146 MHz band can be installed in both horizontal and vertical planes (for operation with vertical polarization and near circular radiation pattern).

Antenna length 1 m.

Antenna SWR in operating range less than 1.5

Maximum power – 500 W

Connector SO239

The antenna is supplied with a 30 cm long dielectric extension for attachment to a metal mast.

Antenna arms are made of 20 x 20 mm square profile for high bandwidth.

Many years of operation have shown high efficiency and excellent reliability of the antenna.

The cost of the antenna is 1500 rubles.

NEW

50 – 75 ohm coaxial adapter for 144 and 432 MHz bands.

Price 1500 rub.

73 м”>

73 м”>

Antenna stack stacking option for 144 MHz and 432 MHz. The narrow horizontal pattern at 144 MHz is useful for narrowing the interfering sector.

Antennas in FD 2011.

VHF Antenna Overview

Over and over again, VHFs ask their older colleagues, “Which antenna to choose?” It is impossible to answer this question precisely, since it all depends on the purpose for which the antenna is being built. If communications are expected in all directions, for example, within a city, then antennas with a circular diagram are very convenient, which often allow you to work at distances between stations equal to 50-100 km. Directional antennas are more suitable for long-distance communications. In “densely populated” areas with ultrashortwaves or in cases where there is interference from some directions, it is undoubtedly better to use highly directional antennas.

These few examples are enough to understand that there is no antenna that is equally suitable for all cases. The radio amateur must choose an antenna that meets his basic requirements. Better yet, build two or three antennas and use them as needed.

It is unreasonable for a novice ultrashortwaver to choose as his first antenna some bulky and complex structure, in the process of building which, due to inexperience, he can make many mistakes. You should start with the construction of the simplest antennas and, as experience and knowledge grow, move on to more complex systems.

When choosing the type of antenna, it is also necessary to take into account what basic materials are available to the designer. If it is not possible to purchase pipes or rods for the antenna elements, then you can choose, for example, a “double square”, which requires only wire, wooden slats and a small amount of insulating material to build. It is also essential how the supply line will be made – from a coaxial or ribbon cable, or simply in the form of a two-wire line.

It should not be overlooked whether any measurements are needed when building an antenna. For a beginner, who also does not have measuring equipment, it is better to choose an antenna that will probably work well without tuning.

Consider a number of antenna types. Among them there are simple designs that can be repeated by every beginner, and complex ones, including antenna systems, that may be of interest to more experienced DX hunters. Since most of our VHFs operate in the 144 MHz band, antenna dimensions are given for this band.

The reader will note that no technical design details are given for any of the antennas. But this should not interfere with the construction, since the methods of work and many details are described in any ham radio handbook.

CIRCULAR ANTENNA

Cross dipole. The antenna consists of two half-wave vibrators 1 located at an angle of 90° to each other (Fig. 1). The radiation pattern of this antenna is far from being a perfect circle, but in practice it gives quite good circular radiation. Since the impedance of one dipole is approximately 70 ohms, when two dipoles are connected in parallel, the impedance is about 35 ohms. We do not have such a coaxial cable at our disposal, so it is best to feed the antenna through a quarter-wave transformer 3, made from a 50-ohm cable. A 75-ohm cable 4 runs from the transformer to the equipment. Balancing U-elbow 2 is made of the same cable.

fig. 1

Vertical antenna (Ground Plane). Radiator 1 (Fig. 2) and radial conductors 2 provide a circular diagram in a horizontal plane. The angle between the radial conductors and the radiator determines the impedance of the antenna.

fig. 2

At an angle of 90° the characteristic impedance is approx. 30 ohms, at an angle of 180° it is 70 ohms. Typically, an angle of 145° is chosen, which allows the antenna to be fed with a 50-ohm cable. The cable is connected to connector 3, mounted on a metal plate, to which radial conductors are electrically connected. The emitter, to which the central conductor of the cable is connected, is installed on the insulator 4.

DIRECTIONAL ANTENNAS

Double square. This most popular directional HF antenna can also be used on VHF (Fig. 3a). Its gain (compared to a half-wave vibrator) reaches 5.7 dB, the ratio of radiation forward / backward is 25 dB.

fig. 3

The distance between the active vibrator 1 and the reflector 2 is chosen to be 0.15 lambda, which makes it possible to feed the antenna with a 75-ohm coaxial cable 3. Experience has shown that the antenna fed in this way works quite satisfactorily. You can tune the antenna using a short-circuited loop included in the break of the reflector frame.

To balance the antenna, you can use a quarter-wave glass (Fig. 3, b), connecting it to the ends of the active vibrator 1. The glass consists of a metal cylinder 4 with two covers – metal 5 and dielectric 6. Cable 3 passes inside the glass, the cable braid is connected to cover 5. The diameter of the cup should be 3-4 times the diameter of the cable.

Antenna elements can be made of copper or aluminum tube, tape or wire of various diameters. “Double square” takes up very little space, structurally simple. This antenna has relatively good performance. Noteworthy is the possibility of placing antennas of different ranges on the same cross-shaped rails.

Triangular antenna (Delta Loop) belongs to the same family as “square”, since the perimeter of the active vibrator is approximately equal to the wavelength. A feature of this antenna is that all elements of its design are metal. The author of the antenna advised to feed it with a 50-ohm coaxial cable, but a 75-ohm cable is also successfully used for this purpose. The simplest triangular antenna is shown in fig. 4. Active vibrator 1 is adjusted using a gamma matching device to which cable 3 is connected. Depending on the availability of measuring instruments, the adjustment is carried out according to the minimum SWR or the maximum signal strength. Reflector 2 can be made unregulated for simplicity.

fig. 4

UA1WW experimented a lot with the triangular antenna. He advises using 5- and 9-element options. The latter, due to the small horizontal angle of radiation, is particularly suitable for long-distance communications. A drawing of a 5-element antenna is shown in fig. 5. Here 1 is an active vibrator, 2 is a reflector, 3-5 are directors. Since this is a completely new antenna for our ultrashortwave antennas, here are some design data.

fig. 5

A 4-sided duralumin tube with a square side of 18-20 mm is most suitable for the supporting traverse, it is much more convenient to mount elements on it than on a round tube (see Fig. 6).

fig. 6

Antenna elements are made of a copper or aluminum tube or rod with a diameter of 6 mm, the horizontal side is made of a wire with a diameter of 3 mm. The dimensions of the elements (according to Fig. 6) are as follows:

length l1, mm

length l2, mm

Reflector

750

720

Active vibrator

710

680

First Director

660

670

Second Director

660

650

Third Director

660

630

Triangular antenna is an object of interest for ultrashortwavers all over the world. Taking into account the positive experience with it, we can assume that it will soon become one of the most popular antennas. Therefore, we draw the attention of those wishing to experiment to one special type of it – a double triangular antenna (Fig. 7). The dimensions of the triangles of this antenna are slightly larger than those of a single one; the perimeter of the reflector is 2266, the active vibrator is 2116 and the director is 1993 mm. The distance between the reflector and the vibrator is 0.2 lambda, between the vibrator and the director is 0.15 lambda.

fig. 7

According to some data, the following gains of a double antenna were obtained (compared to a half-wave vibrator): one element (active vibrator) – 3-4 dB: two elements (vibrator and reflector) – 8-9 dB: three elements (reflector , vibrator to director), – 10-11 dB. It seems that this is a promising type of antenna and it is worth looking into.

10-element antenna (Yagi). Undoubtedly, this is the most popular VHF antenna (Fig. 8). It gives a gain of 13 dB. The author carried out with the help of such an antenna meteor communications with England and Belgium, many long-distance communications due to tropospheric passage and “Aurora”.

fig. 8

The passive elements of the antenna are made of 4 mm bimetallic wire, and the active loop vibrator is made of 15 mm copper tube and the same wire. The characteristic impedance at the feed point is 300 ohms, so the 75 ohm cable is connected through a 68 cm U-bend.

The length of the bearing traverse is slightly more than 3.5 m, the diameter is 20 mm. The length of the reflector 7-1060, vibrator 2-990, directors 3-10 – respectively 933, 930, 927, 924, 921, 918, 915 and 912 mm.

Multi-band antenna. There are circumstances where more than one antenna cannot be installed. But in addition to an antenna, a radio station often needs a television one! Then the way out is a UKB antenna for several bands. One such antenna is shown in Fig. 9, a (top view) and 9, b (axonometric projection). It can be successfully used in the ranges from 50 to 220 MHz. The antenna gain at a frequency of 50 MHz is 7 dB, 144 MHz is 12 dB, and at 220 MHz it is even 13.5 dB. This antenna is double decker. At a frequency of 50 MHz, two corner vibrators 1 operate on each floor, located at a distance of lambda/4. At a frequency of 144 MHz, their length is approximately 3/4 lambda and therefore already a V-shaped antenna is obtained. At 220 MHz, the vibrators are 5/4 lambda long.

fig. 9

The vibrators are connected to each other by two-wire lines 2, and both floors – by lines 3, the length of which, depending on the range, is from 1/4 to 5/4 lambda. The distance between the floors, if desired, can be changed within the limits allowed by the length of the lines 3. The input impedance of the antenna at the feed point 4 at frequencies of 50 and 144 MHz is about 300 ohms, at a frequency of 220 MHz it drops to about 200 ohms.

Antenna elements can be made from a tube or rod: vibrators – 10 mm in diameter; lines 2 – with a diameter of 12 mm (10 mm is also possible, then the distance between the centers of the wires of the line should be chosen equal to 64 mm): lines 3 – with a diameter of 6 mm.