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I don't know much about marine radios. I am a ham radio operator, but they are much the same, if you do not hear any static (with squelch control turned down), then I suspect you are correct about the antenna. It could be the antenna itself, or the coax line to it, or the connection point at the radio or at the antenna. You're stuck without being able to remove it. If you do and find nothing at the radio, you'll need to check the connection at the antenna etc. Good luck.
take off the bottom cover ,find the volume switch on the outside then find it on the inside.Now get some WD-40 and spray the control on the inside with a very,very light squirt of WD - 40. Let it set for a while then try it.It should work.
Black is obviously ground. red is for switched power (only has power when vehicle is on) single yellow or orange is constant power Dual grey and dual white (solid grey/grey with black) and dual etc. are for speakers. the blue is for accessory power for amps and eq's. on the speaker wires the one with markings is for + and the soild is for -.
the unit is shot there is no hope for it. i have seen this problem many times in boats and never been able to fix the problem. i have had customers send the unit back to jensen and received a new one but check and see if your 1 yr guarantee is still good.