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The antennae has to be tuned for the radio not for the band you are listening to. If is a 10 metre band, so you need a 10 metre antennae which enables you to listen to both bands, but looking at the jpg of the radio it gives bands A, B, C, and D, nothing about CB radio itself, but the option of AM and FM radio.. Using the wrong antennae could damage it.
Assuming you don't have the manual,basic controls for receive are to make sure the switch next to the meter is set to s/rf,switch for cb/pa is set cb,knob for rf gain is at max, squelch knob is fully counterclockwise..squelch can be adjusted if ya don't want to hear static but will start cutting out weaker signals.If none of the above works,try plugging in an external speaker to the jack on the back of the radio,if ya still don't hear anything,check that antenna coax is screwed in tightly in back of the radio.Next step after all that would be the microphone,is the stock mic,power mic..if it is the original stock mic that has not been rewired in any,then I would suggest taking radio to qualified cb repair shop,bring mic with you to shop so they can check it too,in fact I would bring the truck also so they can check antenna and adjust it if needed...Good luck
There is a board in the CB called a PCB board. If you open your radio it is a little circuit board. Held onto the side of the radio by a screw and has two or three connectors leading to the board. Replace that little board and your radio will be good as new. I have seen radios come in my shop many times and this is the fix. What that board does is send a signal to the crystals to start mixing a frequency. When it goes out it just sticks where it is at. Here is a link to a place that can take care of you. http://www.hyelectronics.com/default.asp You tell them you need the little PCB board for a Connex 3300 inside the radio. Might be $35 or so.