Theremin Antenna Websites
RCATheremin.com
A comprehensive site for Leon Theremin designed and built musical instruments.
Not Applicable 
$ 8.95
Theremin Biz — Theremin store and electronic music shop selling Moog Etherwave Theremins, Theremin kits, Theremin accessories and antennas.
Theremin store and online shop selling Moog theremins, theremin kits and accessories, as well as theremin music by Clara Rockmore, Lydia Kavina and other electronic music.
Not Applicable $ 8.95