Well, there's a lot going on in a Sunfire that isn't dedicated to it being a tuner. I suspect there just isn't room for all the stuff you can put into a dedicated or semi-dedicated box. Most receiver tuners aren't very good anyway. I'd try a roof antenna. I get decent reception on my Sunfire, but I have line-of-sight view of the towers from my house about 20 miles away. They are on the top of what we call South Mountain here in Phoenix, and I live on the side of the McDowell Mountains across the valley from them. Nothing but air between me and them.
It should sound like it isn't there.
There is a difference between hearing and listening...
Making life enjoyable through expensive electronics.
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Carver: C-4000 & C-1 preamps, PSC-60 preamp/tuner, TX-11a tuner, C-500, M-1.0t, M-400 (2), M-500, M-500-t+, M-500t Mk.II, A-500x, AL-III loudspeakers (2 pr)
Sunfire: Theater Grand III processor, Ultimate Receiver, Cinema Grand Signature 400 ~ seven, True Subwoofer Mk. II, D-10 Subwoofer