HDTV Antenna Reception Audio Questions.

[poppj]

Hello all, thanks in advance for any help.

I have a Sharp LC42D64U TV which has worked nicely for the past several months. I currently have cheap-o rabbit ears for my reception, and it works well for the most part. (very cheap, as in $10 or less)

My problem is that sometimes, on certain stations, the audio signal is very weak, and sometimes the dialog drops very low and its hard to hear. When this happens though, the other audio comes in loud and clear (for example, noise effects, music, background noises etc). Ive noticed it more on CBS and PBS while recieving the HD broadcast. If i change the channel to the analog broadcast of the same station, the problem is gone. FWI, the video quality does not suffer whatsoever, and under my digitial settings on the TV, it says the signal strength is in the 70s-80s.

Ive been considering buying a $30-$50 HD antenna in hopes that this could be the problem. Any ideas?