Why bother with all that? Get a VHS machine or similar (with an RF modulator), daisy chain 3 or 4 aerial signal boosters in line off of it (those ones you use to boost output from TV aerials in poor signal areas - nothing fancy), and wire the output of that into a standard TV aerial.
My mates and I did this in college (using my mid-80s Panasonic PAL VHS machine, and 4 Labgear signal boosters) and were able to broadcast fairly well over a 40 metre range or so. Not sure if the metal-framed building we were in added to the effect or not, but friends in an adjacent dormitary block were able to pick it up well.
We "debuted" "THe LoSt BoYS" the night before BBC1 showed it - but ours was uncut. Also broadcast other interesting titbits including soft porn, but had to dismantle the rig after 3 weeks or so as some neighbours just off the college campus were complaining about interference.
The staff never did suss out it was us, but they had their suspicions
