We don't have an issue with the Sony. It picks up ABC much better than the normal aerial, so goodness knows what's going on in there. We've had it about 2 years now so models are of no use, in fact you wouldn't even be able to buy the same specs anymore.
You could always trade in the tv for one with a built in tuna...or tuner if you like as they smell less
Seriously, we have a Sony TV too and neither has skipped a beat. Wouldn't get anything LG again as hard disk recorder is one and its been trouble since an early age. Don't know if you have one, but you can now get STB's with a built in disk which may be worthwhile if you don't have one. Wouldn't be without one.