Check out page 6 of this PDF file. It says RF cable connecting from antenna to receiver. Maybe I have confused myself..lol
http://www.bestmediausa.com/ebay/pdf/TOPTRONICS_ANT_MANUAL.pdf
Hopefully this link will work. There is only one screw on RF/ANT/CABLE jack on the left hand side of the receiver rear. It is labeled TV ANT/Cable In. This is where to connect your external TV antenna.
Do not use the jack next to it labeled "REMOTE ANTENNA". That is for the small antenna for the remote to TV2.
Tech Portal : 622 : Receiver Information : Receiver Images