Not sure what came with your Denon. But, you may have significant reception problems in your basement.

You might try taking a piece of plain old speaker wire and splitting it down the center for about 18". Try to make a T out of it. Connect the bottom end to your Denon's 300 ohm FM terminals and see what happens.

The Rat. M80s, VP-150, QS8s, SVS PC 20-39+, OPPO, Onkyo 703s, Harmony 880 Sony 60" SXRD HDTV