I've only piped the antenna to the other unit once, normally I like to put the antenna with the radio as well. If the handrails are reasonably easy to insulate, I use them. On a few, I've put TMCC in the locomotive and floated the whole shell, some older first generation TMCC did that as well. I will say that a vast majority of my TMCC upgrades have been in the tender, there usually seems to be more room for them there.
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