Same here:
(Ignore the red arrow. It points to a powered USB hub. I used this picture in another forum. I deleted the original and am too damn lazy to take another picture.)
Both the modem (an Arris TM822 cable modem) and wireless router (D-Link DIR-615) are sitting right next to each other on top of the PC which is (obviously!) right next to the radio. Computers and their peripherals can indeed play in the same sandbox as radio gear.
Add one more vote for having Comcast resolve the issue.