As you noted, there is not replacement for the Condorde. It was junk any as there was no amplifier in the head but instead the signal came down to a booster inside the coach.
What you have yet to learn (like I did when I removed mine) is the if you remove the Concorde there is a huge hole in the roof (6" maybe) when the electronic for the Concorde reside. That will need to be repaired/covered and then install the new antenna over that or off to the side.
If you have a location where you could relocate an antenna and have a clear ceiling space for the crank I would install the Winegard Sensar IV (Batwing) and use the existing coax for the best affordable antenna. If you want simple you can install the Winegard dome style automatic antenna and use the existing coax and 12V power using the Concord wiring
