The antenna on the 73 which is located front left side, goes up only 2 stages. It looks as if it should go atleast 1 maybe 2 more stages up. This is causing very poor reception. My question is how do you access the power antenna motor box? I have checked inside front left fender well, engine compartment,and door sille area, I can not find any access door. Please help.

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Stable:
1973 450sl
1978 red diamond ice vette
1975 steel blue convertable vette
2002 steel blue dakota quad.