wa8yxm - As per the instructions (which worked away from the RV), one end of the coax screws onto the antenna. Other end of coax screws into the power inserter. Other end of inserter goes into receiver (along with inserter power cord being plugged in). Then of course, receiver to TV.
I believe the problem is that I'm attempting to hook in the inserter AFTER the incoming coax cable has been split (in the wall somewhere). Gonna have to dig behind the interior wall plate, to see if the "splitting" is within reach, so I can get to the main coax coming from the outside connection.