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The problem may be in the audio output chip mounted on the chassis, also! there is also a small capacitor located next to the audio chip that has known to be a problem, finally sub the speaker for another, often a source of trouble.
I,m not familiar with the Yamaha but most receivers are set up the same way. In your setup menu are the speakers marked on in the display?. Your DVR needs to be transmitting in 5.1 to start with. If this is the case then make sure you select the correct audio function on the receiver.
The surround processing portion of the unit has a problem. In either stereo or direct mode, the digital procesing is bypassed. This could be just the surround processing IC, but that IC may not be available as a separate part. I would suggest that you bring this unit to an authorized Onkyo service center for an estimate.
CB radios use a frequency range and technology that is prone to noises
both atmospheric, and man made. The height and gain of your new base
antenna may produce more static than you may have noticed before. The
question is 1) is the antenna close to any power lines to your home, 2)
do you notice any increase or decrease of received signals compared to
your mobile, 3) is the static steady or does it come and go.