Tweak WiFi Antenna on D200

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I'm not convinced an extended antenna reach is going to be the be all/end all nirvana SQ-wise you might expect as it doesn't address all the EMI/RFI in-the-box. But if you'd like to play a role in finding out there's a project you could help with. Make three 4 or 5 folded over layer pieces of tin foil large enough to cover both bottom viewing windows individually and one large enough to cover the entire GUI. Tape foil over those things then try using your remote with all blocking shields in place. Then untape them one at a time and try again from various positions and distances. From this you will pretty much confirm with 100% certainty where the receiver is tho be careful if it turns out to be one of the bottom viewing ports as there 'may' be some cross-talk from one to the other but one should prove dominant to the other and determined by RC ease-of-use. Once done we have a jumping-off point on where to concentrate the attempt, we're half way there. All that remains is to solder a small test lead that extends outside the box and nearer the wifi. I'm happy to do the test lead soldering on mine as my warranty is already toast.

But here's the rub... even with a dramatically improved wifi antenna I suspect all the EMI/RFI in the box is going to negatively influence everything incoming before it gets to the speakers... it still won't be pretty SQ.

I think you're confusing matters by discussing the remote control here - or do you think the remote control is affecting the sound quality?  Put another way: I'm pretty sure the remote control is using a different receiver to the wi-fi interface used by AIR.  So, although your experiment might be interesting, I don't think it has any bearing on wi-fi performance.