Over the air TV reception drop when receiver on

Hi,

I have an indoor antenna and, when I turn on my Denon avr-x3600h receiver, the quality of the reception drops a bit. It's specially true with one channel. Receiver on I lose that channel but get it back when the receiver is off. Antenna is almost a meter from receiver. Antenna-TV cable is a RG-6 from primecables, thus it's shielded. I'm clueless of what might cause this.

Someone has the answer?

thanks