I've just set up an A99 antenna, to my grandfather's Sears Roadtalker 40 base/mobile and it doesn't seem like I can transmit or be heard? My antenna is set up at 40 ft., next to my house; the meters swing to the extreme right when I squawk, but never an answer. I live in West Chicago, IL, and pick up Oklahoma....on USB. It's the original Sears mic - do I need an upgrade or additional tuning?