UNDERSTANDING ANTENNA POLARITY.
Why do I have trouble with TV signal at some locations?
What the Caravanner must understand is the need for the antenna to be mounted to match the transmitted signal – vertically for a vertically polarized transmission and horizontally for a horizontally transmitted signal.When wrongly mounted, in addition to the signal level drops, is the large information loss of the wanted channel.
In fact, it can be very possible to get a reasonable signal level but not be able to produce a stable picture. The image will break up (pixilate), just stop and start frequently or not work at all!
Add to this the fact that vertical transmissions do Not travel as far as horizontal transmissions and are generally designed to service a local area only. They are therefore only very low powered Transmitters. As little as 5-WATT!. This compares to capital city transmitter of 50 Kilowatt. This means that a mast head amplifier for those signals can be a very important tool