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Chapster
You did not specify AM Band or FM Band. You didn't specify the Radio Make, Model.
You didn't specify Static or Signal Strength issue.
Check Radio Ground. Check Antenna Ground. Check Coaxial Cable integrity, full length. Could have or should have a Noise Suppressor on the Coil and Alternator.
If AM Band weak, then many older radios have an adjustable pot, capacitor, trimmer, requiring a small screwdriver, with the radio tuned to 1400kHz, adjust the center screw in small increments, one direction or the other, until you get the best/loudest reception.
If FM Band then Full Up on the Antenna is not always the best. Antenna length should be tuned to the Station's Frequency. I have modified my Volvo Electric Antenna to raise/lower far enough, to get the best reception.
Also, does your Radio have a Local/Distant button?
Antenna type and position on the car makes a big difference. In most modern car-installations, there are multiple antennae located on the car and in the windscreens and a system that detects and uses certain antennae for the strongest signal. Technology has come that far from the days our Volvos were built.
Good luck, hope this helps.
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