If you can find one used, and only want "SD"..there's a great pair of boxes radio shack used to sell, often on Ebay. Called the "Audio Video Network" (# 15-1975) from the older days......and, quite honestly, it works great sending SD video and STEREO audio over your phone line from jack to jack, with a box at each end! I'm sending SD from a DVD player, 410 satellite, and FTA through one (switcher ahead of it)....from INSIDE an RV, through the RV's phone jacks, then into my office the RV is attached-to. Highly recommend. And, they also relay remote control back to the unit.
Come to think of it, the wireless version of this today ain't bad either.....but 2.4 gig version can have problems with your wireless internet.....I think X10.com still sells 'em.