Maybe there are some other weirdos out there, who like their t-shirts geeky, with antennas or a smith chart?
Newest design: Superhet
My own shirt designs: hade @ shirtcity.ch
One of my favorite shirt designs: Moai @ Amorphia Apparel, Cult(ure) meets technology
...really more like (amateur) radio operator evolution, but still a nice design with an interesting statement: Antenna Evolution @ Cafepress
Roman pointed this one out to me - and of course I had to have it: RF Radiation Hazard @ Redbubble
Picture of Tesla's great experiment, by InvictusCreations: Tesla's Wardenclyffe Tower @ Etsy
(that's not me, btw)