OK guys (ahlemann, Joe6pak). A little knowledge is a dangerous thing. The danger here is if you hook things up wrong, you end up transmitting your receiver signal back up to the OTA antenna, and around the neighborhood. The FCC frowns upon this, and so will your neighbors (unless they like what you watch - hmmm?).
That being said, here's a few tidbits. First, OTA broadcasting occurs in 2 bands - VHF (2-13) and UHF (14-83 in the old days - the ends have been chopped off for other uses now). Second, there is no OTA modulator in the box - it just switches OTA vs. it's own output. Third, the Antenna In jack is only for TV1 (known in the manual as the 'nearby' TV). Fourth, it would be very hard to explain the proper hookups and equipment to combine the OTA & TV2 output without pictures, and I don't have any. Sorry, but I think a trip to see the local TV expert is needed to move forward on that. Finally, I think a review of the 522 user's manual, especially pages 18-20 & 33, is in order.