The " big 3" networks in Chattanooga Tennessee are in the VHF range. With my amplified rabbit ears depending on how long I extend the rods, the signal level drops by around 10-15 points for no apparent reason. Nothing moving near the antenna and with the adjustable gain I even have it set to the lowest setting to get a signal between 50-80. I can't figure out why. Is it the wiring in my apartment? Even up high it does the same thing. Any thoughts?...Thanks.