Antenna Types

TV Reception is always an issue for caravanners. Unlike in most homes where TV antennas are professionally set up once and never moved again (unless moved by a storm or renovations), caravanners may have to retune every time they move. Therefore, selecting the best antenna for the job is paramount. Now there can be a lot of confusion with the many various shapes and designs of antennas as many have different performances at different frequencies. The basic types of antennas are:

• Phased Array


• Yagi


• Omni-directional


• Log-Periodic (including European models)


• Tuned dipole

The theme presented for the modern caravanner is; the choice of antenna, the ways of tuning the antenna and some creative problem solving to ensure the best reception the antenna could possibly obtain. If TV entertainment whilst caravanning is important, then height and elevation may be helpful for better reception. A good idea is to choose an elevated campsite or provide extension solutions such as a piece of long pipe or some sort of telescopic device to gain extra height.

 Phased Array

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This is a common and popular UHF antenna because it covers the UHF channels 28 to 69 range of frequencies. By phased array, it is meant that two or more single antennas are connected in such a way that the signals independently collected are channelled together to make one signal. The result is an increase in signal strength. This setup generally has no directors in front (the smaller bars that extend forward on the Yagi antenna type) which makes them less frequency specific and therefore will work over a larger range of frequencies than a Yagi. They also tend to have a relatively even gain of signal across the whole range of UHF frequencies. This is important for digital signals and provides a very suitable antenna for caravans.

 Omni-directional

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Using an Omni-directional antenna for caravanning would be highly unsatisfactory. This type of antenna was typically designed for marine use. These antennas, which are often covered in plastic, work well at sea because there are no obstacles to cause issues. Since there are many obstacles on land, these obstacles cause additional signals to be received by the antenna. These additional signals (either from behind or the side) may lead to ghosting or severe signal degradation of the incoming signal by the reflected signals. The signal can be so bad that the picture starts to break up, so for an antenna to work well - it must be directional. In circumstances where good results are achieved on a device like this, some would argue that a pair of rabbit ears with an amplifier would work just as well.

 Log-Periodic

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This style of antenna is quite good for caravan use because it’s very broadband (wide band of frequencies) and offers reasonable gain. The slight downside is there are usually too many elements poking out and this makes the antenna feel very big and awkward to carry. They also struggle on channels 0 to 5A because these antennas are not usually designed for this frequency range these days. Now with that said however, do not forget there are less than 70 transmitters out of a total of 3726 that are in this frequency range.

 Tuned dipole

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This is a fairly common caravan antenna as these units are like an indoor rabbit ear, but mechanically designed for outside use. They are covered in PVC to hide the working bits and rely on harmonics to provide them with the range of channels they must pick up. This antenna is quite effective in good signal areas and very effective in weak signal areas where the dipole length suits the exact channel being transmitted.

The unfortunate downside is they are primarily made to suite channels 0 to 5A. They would do better if they added a UHF dipole and diplexed (a method of connecting a UHF and VHF antenna) them together to suit the situation today where 87% of signals are in UHF. The antenna’s performance varies from excellent to non-existent and so when travelling; it is generally limited in areas that have lower signal strength.

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JohnEss : 17 Apr 08 22:26

Wilmo : 17 Apr 08 20:59