I am an HDTV beginner. I currently have Directv with a triple LNB. I know I need the HD receiver box. Is one better than another? I also live about 30 miles from the towers but I have some radio towers close to the house. Does a cheapy $30.00 antenna work just as well as a $150.00 Winegard antenna? I read that Directv could/would provide antenna . Any help would be appreciated.