We replaced the Star Trek Enterprise looking antenna the came with our coach, with two different OTA's:
1) I had a crank up Sensar IV installed. Mostly because I wanted to attach a WiFi antenna to the mast, and be able to raise it to improve WiFi reception when in marginal coverage areas of a RV Park.
We have this unit set to "B", as I do not use it for OTA very often.
2) We had the Winegard RAZR Auto installed as our "A" OTA antenna. (Have an A/B switch to shuffle between the two as needed.)
The RAZR Auto is a KISS approach of the DW. She pushes a button, and 9 times out of 10's, we get all of the OTA channels in an areas we want. For those times when we're boon docking 25+ miles away from the broadcasting antenna, we can then raise the manual antenna, and it will pull in those channels for us.
If I only could have one, it would be the crank up unit.
Best of luck to you,
Roo II is our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...