I had the same problem with our 2007 2720SL. I checked the thread pointed out by Texas_Camper and started a cable hunt behind the refrigerator panels.
It turns out that the cable coming from the actual antenna itself was stripped for an RG-6 F connector, but there was no actual connector on it at all... it was just lying there at the bottom of the refrigerator panel, unconnected.
I crimped on a new connector and with a coupler, was able to connect it to the dangling connector that goes to the winegard panel next to the refrigerator.
I get exceptional reception now.
Check the bottom external panel of the refrigerator... it will be a grey coax coming up from the floor. I don't know if this is your problem, but I was surprised to see this.
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