Without a good antenna and coax you are wasting your time trying to talk 10 miles. That old JC Penney put out 3 or 4 watts on a good day (before the electrolytic capacitors dried up from old age). It is a vintage piece of work that will not talk very far to begin with. It will receive ok on TV coax, maybe 5 miles on a good day, but don't even think about transmitting into it.
If you really want CB to get out 10 miles put up a decent 1/4 wave "droopy drawers" ground plane, or a 5/8 wave base antenna, or better yet a 2 or 3 element beam and at least RG58 (not the Ebay Chines knock-off crap) or better coax with properly attached connectors. The problem with home made antenna rigs is without proper test (SWR, return loss bridge etc.) equipment you have no idea if it is correct for the frequency.
Shine up that old JC Penney as an antique, and then throw $30.00 at Amazon for a new Uniden PRO505XL 40-Channel CB Radio and start playing with antennas (as high up in the air as you can manage).
PS: Check if your 12 volt power supply is a decent "regulated" power supply. If not it will terrorize your 27 Mhz AM receiver with junk noise.
If you really want CB to get out 10 miles put up a decent 1/4 wave "droopy drawers" ground plane, or a 5/8 wave base antenna, or better yet a 2 or 3 element beam and at least RG58 (not the Ebay Chines knock-off crap) or better coax with properly attached connectors. The problem with home made antenna rigs is without proper test (SWR, return loss bridge etc.) equipment you have no idea if it is correct for the frequency.
Shine up that old JC Penney as an antique, and then throw $30.00 at Amazon for a new Uniden PRO505XL 40-Channel CB Radio and start playing with antennas (as high up in the air as you can manage).
PS: Check if your 12 volt power supply is a decent "regulated" power supply. If not it will terrorize your 27 Mhz AM receiver with junk noise.
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