I have one of those cheap signal finder indicators that beep louder when signal is stronger. Tried to peak signal for Me TV but could not get a steady reading. the needle would bounce around then settle for a few seconds then jump/bounce again . I could not get a calm steady reading on any bird I tried. The signal strength display on the receiver is steady but lags so it takes awhile for it to indicate a change. So , is this normal or is the squeaker defective? . Anyone else tried this recently?