[MENTION=53523]Ironhead1970[/MENTION],
Please explain this a bit more.... Do you have a King Jack head on top of a crank up antenna mast?
If so, that antenna head replaced the original "batwing" antenna head from Winegard. You basically have a Winegard Sensor IV antenna with a King Jack head.
If my assumption is right then there should be a coax coming from the antenna and into the boot at the base of the antenna and from there it goes into you roof cavity (attic). You can access it by removing the inside crank mechanism. It should connect to the RV's antenna connection that feeds to your antenna/cable wall plate switch.
As for a signal finder, that is something external as far as I know. Not knowing anything about it - if it is a feed through device then the antenna goes into one end and the RV's coax into the other. If it isn't a feed through then I'm not sure how they expect you to use it.
I'd suggest not bothering with some external signal finder and getting the app call "TV Towers" and use it to locate RV towers and manual point your antenna toward them.
btw - for your's and others' info - there is no such thing as an HDTV antenna; yea, lots are advertised, but antenna transmission hasn't changed since the beginning of TV transmissions; only what is transmitted (digital vs. analog) data. The "hype" has changed along with the 'snake oil' salesman' pitches.