I have a very similiar situation. I have a 50'' samsung plasma and do not have a cable box, I do however have Comcast high speed internet.
I also have a Avermedia volar max usb dongle. Through using the autoscan with coaxil plugged into both devices I pick up channels I know I should not be getting. Such as Espn, Mtv, and at least 12
HD channels. All I am charged for is Internet service from Comcast.
I hope they never fix this!