I am wondering about hd and these over the air recievers. Can you buy one of them along with an hd antenna and recieve hd as well as standard uhf/vhf channels? I currently have comcast and am wondering if over the long run it would be cheaper for me to buy a reciever/antenna. Are there any hidden charges, and would I get like espnhd, comcasthd, etc. over the air with such a combo. I live in Boyertown, PA and currently have comcast for a point of reference. Thanks for all help with this as I am a newbie with hd!