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I have found the 12 volt system a little twitchy and decided not to screw around with it when hooking up accessories.
... I was also going to try splicing in additional antenna wire across the top of the windshield and down the drivers A-pillar. Not sure if this will help with the horrible reception.
I would be very interested in whether this helps.
.That's where Tesla's secret recall moved it, does help but still very bad.
.
What do they do?
Anything special antenna wire? I was thinking about using antenna from home stereo.
They don't do anything special, they relocate the antenna that's now extended/logner and route it up the passenger sill. Is your Roadster still under warranty? If not you can try calling/making an appointment to have your antenna re-routed due to poor radio reception under the silent recall.