In the middle of the FM band (94 MHz) this is about 80 cm. Due to the
magnetic and electrical eld of the vehicle and the effect of the coaxial cable,
the most practical length is about 1 m. Some smaller aerials are available
but whilst these may be more practical the signal strength is reduced. Aerials
embedded into the vehicle windows or using the heated rear window element
are good from the damage prevention aspect and insensitivity to moisture,
but produce a weaker signal, often requiring an aerial amplier to be included.
Note that this will also amplify interference. Some top-range vehicles use a rod
aerial and a screen ...
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