multicoupler has worked GREAT for the last two years. for past two weeks 4 scanners became very quiet. I put portable antenna on all 4 scanners and they began talking again. Suspecting the antenna , I bypassed multicoupler and went from antenna direct to one of the scanners. a lot of traffic with direct connect to the scanner. Paid $200.00 for the multicoupler. Is there any sure way to check the multicoupler. If it is bad, is there somewhere it can be sent for repair. thank you for your time