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			Is the pre-amp set to combine? Is the FM trap in the on position?  
 
I would also try installing a Radio Shack FM trap between the amp & antenna. You have a 250 watt FM station right in town (91.3). The internal trap of that amp does not effectively attenuate FM stations below 95Mhz.
		 
		
		
		
		
		
		
		
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