Reception has little to do with grounding. The ground plan is for transmitting. As long as the coax is connected and is in good standing, it should receive fine regardless of grounding.
There are a few reasons you may have bad reception.
- Turn the RF GAIN all the way up. This is your receive sensitivity.
- Squelch is too high. It should only be turned up enough to cut out the background noise.
- Poor antenna. If the antenna is cheap, and not made well, this could be the problem.
- Not enough of the antenna above the vehicle. It needs to be at least 60% of the antenna above the vehicle.
Hope this helps!
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