All-righty then. It's really simple, but it took a few years to figure out.
First, I'll go over the list of gear I use for easy setup and tear down. Obviously, get a transmitter. I use the Broadcast Warehouse TX 150. 150 watts. Plenty of power for a small town. Here's the full list of ones they make:
I use the 6th one down from the top- 150W power. They go up to 1000 watts and down to 1watt. UK based company, excellent products.
Next you need an antenna. I prefer one of two antenna's. The first one is an old pirate radio standby called a Comet. Cheap, easy to set up, easy to tune. Model number CFM95SL 5/8 wave.