bat wing upgrade?

I have a remote cabin which prior to the hd conversion we could get a few channels through a big roof mount antenna. After the convert we received nothing. No worries it's a cabin so use the DVD. Ran across an inexpensive pole mount hd antenna with remote. Installed it and wow great reception on 8 channels.

So here's the question, we have a 07 Hr ambassador with the standard
winegard batwing. Can we add something to the unit we have to improve hd tv reception or I have seen window mounts that on the surface seem impressive.

Thoughts,opinions please.

Jw