Almost every reception problem is caused by one of two things: a bad ground on the antenna, or a bad antenna cable running from the antenna to the radio.
There are (2) parts to an antenna and you have to understand the antenna cable itself. Antenna cables are coaxial style cables. Coax cables have a thin center conductor wire at the center of the cable and an outer metal braid just under the plastic jacket of the cable. The center conductor carries the signal and the outer shield serves two purposes, it shields the inner conductor from radiated noises and acts as the negative voltage path. 99% of antenna reception problems can be traced to either one of these two parts of the antenna cable.
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