I have an Onkyo TX-8011 stereo AM/FM receiver and the main problem I have with it is that the FM reception has slowly degraded over several years. I have tried many different antennas in the attic but the one that works best so far is just a 4 foot piece of wire run vertically on the wall behind the receiver and stuck into the F-type connector on the back of the receiver. It barely works. I have the FM stereo/FM automatic switch set to Automatic so it switches to Mono when the signal is weak and the Stereo indicator never comes on on any channel (indicating that all channels are too weak for stereo to work). All stations have static. Many channels have multiple stations talking over each other. I have an outdoor TV antenna and my TV has a signal strength meter which tells me most TV channels are 100% and all are at least 90%. I read that FM signals are within the TV signal frequency range so I tried moving the TV antenna cable from the TV to the receiver and I got nothing. Not even static. I plugged the wire-on-the-wall back in and I got the same static as before. Could the signal from the TV antenna be too powerful and the Onkyo can't process it? Do I need a splitter to strip the FM radio signal off of the TV antenna signal? I am not sure if the problem is some sort of interference or shielding that prevents FM signals from reaching my house (zip code 77092 in Houston), or all of the antennas I have tried are defective, or the receiver is defective. There is a huge oak tree in the yard next door blocking the path between my house and the antenna farm for both my favorite FM station and all of the TV stations. Is there a way to measure the FM signal strength and/or quality at the end of the antenna cable at the receiver? I suppose I could buy a new receiver and, if it doesn't work either, take it back for a refund but I am reluctant to do that. Also, is it important for the receiver to be grounded? The receiver has a 2 wire cord but there is a ground terminal on the back and I ran a wire from it to the equipment ground on an A/C receptacle but it did not help.