Communicating with an Arduino that is relatively far away

[quote author=Coding Badly link=topic=132089.msg993569#msg993569 date=1352747232]

To make matters worse we're going to be in a noisy environment too

As in...
• People shouting at each other?
• 16,500 volt motors going on and off?
• Run-of-the-mill 110 volt lines?[/quote]
Thanks for the suggestions, gives me something more to read up about!

Noisy both sound wise (racing engines with undampened exhausts, anything from 50cc mopeds to huge V8s) and probably worse than that: electromagnetic interference from the ignition systems on those engines.