Low-noise voltage regulator

[Mike(Mont)]

Probably wasting my time here but was wondering if anyone knows about a low-noise voltage regulator? Have a 500ma load at five volts. I got one of those adjustable ones from ebay and it is noisy.

My theory is there is a large amount of electronic pollution and when it is near the receiver antenna probably where one of the problems is with the ToTeM. So far my solution has been to use the proper voltage battery (no regulator) and 5 volts not easy to come by. Used a 4.8 volt NiMH and it doesn't last very long. Any help would be appreciated. Need 500ma 5volts +-0.5v. thanks