Signals to TV aerials need to be polarized to enhance reception efficiency and minimize interference. Conventional aerials, typically consisting of vertical or horizontal wires, are designed to be sensitive only to signals with matching polarization. This design allows for better channel utilization and reduces interference from nearby stations by ensuring that aerials in close proximity operate on different polarizations. Additionally, rotating an aerial around its boom axis can effectively eliminate reception from unwanted stations.
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Conventional aerials - like most of the ones you see on rooftops - consist of a set of wires that lie in a particular plane (vertical or horizontal, usually). They are only sensitive to signals with either horizontal or vertically polarised Electric Fields and will not pick up signals with the opposite polarisation. So the transmitting aerial will also consist, basically, of vertical or horizontal wires. All aerials, tansmititing and receiving, in a particular area have the same polarisation and it is often arranged that (TV) aerials in nearby areas work on a different polarisation. This gives some protection agains interference from nearby stations and allows better use to be made of the available channels.Giada said:is it because by polarising the em waves, it restricts the area needed to receive them, which makes it easier, otherwise you'd need to create moving tv aerials which wouldn't be convenient?