I don't think there is a problem with your receive equipment, I think it is just the receive level you have. KETV-DT's transmit antenna as compared to WOWT-DT is roughly 500' lower in elevation. I believe that is the main problem. A little more power would help, but elevation is the biggest factor. This will get better in June of this year when we install our permanent antenna at the top of the tower, and increase power to 300Kw.
I just tuned to channel 20 and watched for 5 minutes and did not notice the audio dropouts. I have line of sight to the towers at 72nd street from my house, so my signal is really good.
I watched the Sound of Music Sunday night myself in surround sound, and did not have any problems. I did however notice the audio level dropped quite a bit switching from ABC in 5.1 to local. I did make some adjustments on my Dolby audio encoder on the 5.1 side this week, and I believe I have them matched between ABC in HD and local.
KETV Hearst - Argyle Television