Indeed, the wall regs are flaky at best. I only mentioned them to illustrate that I've tried multiple sources of power.
Rangevideo.com no longer hosts the page that describes the tx/rx I bought. The only model they have on their site is this one, which is not similar to what I'm using. However, DPCAV does carry what appears to be a model identical to what I'm using, shown here. This seems to be the best match to an equivalent transmitter.
For antennas, I always use the +8dbi patch antenna from Rangevideo on the receiver. The transmitter always uses the +3dbi dipole from same.