For my instrumental unit I use what today would be the AKG WMS 450 Guitar Set. It's a UHF dual-diversity (meaning it has 2 receivers in it and is constantly looking for the best signal from each of the receivers). I can also choose channels, thus avoiding interference in different locales. As I mentioned, I've altered the beltpack by having 90-degree plugs installed so I can use it with autoharps and fiddles and not have the plugs interfere with my playing.

For my vocal unit I use a Shure UC unit with a Beta87 mic. I love this mic.