Start with a shovel, better yet a bobcat.LOL

A BUNKER PERHAPS if not a deep hole

1. A FM or AM radio transmitter that will broadcast in the commercial AM/FM bands is the most obvious start. 2. An antenna appropriate to the frequency you want to use. 3. A SWR meter to check signal being sent to the antenna. 4. A good microphone and mixer board if you want to broadcast music. 5. Any CD/LP/tape player you will use for music. 6. A good lawyer on retainer for when the FCC rolls in to seize your equipment and charge you with illegal use of commercial airwaves. Y'see, almost all of the AM/FM frequencies are in the hands of very, very few media conglomerates. There isn't anymore bandwidth that can be allocated to the commercial AM/FM window, so media conglomerates have to pay a lot to get even a sliver of bandwith in almost any urban market. In many cities, the separation between FM stations is as small as 0.2 Mhz, barely small enough to keep stations from stepping on each other. When you start broadcasting, the odds are you will step on a commercial channel's signal. If people start calling the station complaing of interference, the station will call for a radio detection company to come out and start searching the area where the interference is reported. Since FM radio travels line-of-sight, it will not be hard for them to triangulate your position, especially if you have an antenna up. If you're willing to do the time, go ahead and do the crime.