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KenTemm,
Antennas are designed for particular frequencies/wavelenghts. AM in the KHz (thousands of cycles per second), FM (88 to 108 MHz millions of cycle per sec), Cellular/PCS (800 and 1900 MHz). Frequency and wavelength depend one on each other: the higher the frequency, the shorter the wavelength (or antenna lenght)
So, without getting into antenna designs and gains, typically the shorter the antenna, the higher the frequency. So with the stubbies you may not notice a difference with FM which is much higher freqency than AM. That would partially explain it.
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Z4MC
Canada
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