First let me say this is probably illegal and if you broadcast copy-written materiel, you can bet the farm it's illegal. 
That being said, you will need three things to create your own broadcast station.
1) A recording/player device like a VCR or DVD player.
2) A tv signal amplifier or pre-amp.
3) A tv antenna.
If you already know how to hook all three units up for tv reception, you will simply reverse it.
Here's how to do it.
Take the VCR 'out' cable that goes to the tv and connect that cable into the signal amplifiers 'input' instead
(disconnecting the VCR from your tv will require another antenna be hooked to your tv to receive the signal).
Take the 'output' cable from the amplifier and connect it to the Antenna and you're broadcasting!
It's as easy as that.
The signal won't go out very far, maybe 500 to 1000 feet, but you can amuse yourself and your neighbors for hours!
That being said, you will need three things to create your own broadcast station.
1) A recording/player device like a VCR or DVD player.
2) A tv signal amplifier or pre-amp.
3) A tv antenna.
If you already know how to hook all three units up for tv reception, you will simply reverse it.
Here's how to do it.
Take the VCR 'out' cable that goes to the tv and connect that cable into the signal amplifiers 'input' instead
(disconnecting the VCR from your tv will require another antenna be hooked to your tv to receive the signal).
Take the 'output' cable from the amplifier and connect it to the Antenna and you're broadcasting!
It's as easy as that.
The signal won't go out very far, maybe 500 to 1000 feet, but you can amuse yourself and your neighbors for hours!