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If you've removed the coax from the radio and the noise is still there, I think you've pretty well ruled out the antenna as the problem.  I'm afraid it's something to do with either the radio, or something inside your house -near- that radio that's the noise maker. 

Antennas just don't produce noise, or anything else for that matter.  They are just the 'window' that RF 'sunlight' gets in through.  They don't make any of that RF 'sunlight' , they just let it in so the radio can see it.  A fault with an antenna usually means it either lets something 'through' or it doesn't, or maybe just lets a little bit through (tinted windows?).

So, what are some of the other possibilities?  The radio is probably the most likely from what you've described.  Not a very happy thought, but that's what things point toward.

Good luck.

 - 'Doc