I too have been looking into this. I know Bose make a set that are able to be hooked to the unit and then it says they can be moved up to 100 feet away! Thats quite a ways, so even if the TT interfiered with the signal, you should still be able to set them outside under the awning and not have a problem.
I was thinking of this so if you're on the beach in BAJA and want to be jammin to some Marley and cant pull the TT right to the water, the speakers can still follow
Let me know if you get any and I'll do the same. I know B&H Phot has a huge website that covers almost everything electronic (Thats where I was looking at the Bose) There are a few other manufactureres but Bose has never let me down in the past