You could try and find the original Segment type antenna, or just buy a batwing to put on top of the mast if you want to use the tv.
I installed a batwing with teh included amplifier/12V receptacle, and it works very well. I get 15 channels in San Clemente!
The batwing is very light, and you couild fabricate a holder for it to go on your mast.
If you buy the whole kit, then you will have the riser adn inside handle etc, but that would require drilling holes, and routing the antenna wire somehow. ( which you said you did not want to do)
You can stop by any time, I am in Orange. My Airstream is parked in my warehouse.