On Sun, Aug 3, 2014 at 2:38 PM, Phil Keller <phil@pkeller.net> wrote:

>    MicroPower FM Station:

That is certainly the easiest and cheapest route, particularly if you
already have a bunch of FM receivers, but power output is extremely
limited without a license.

http://www.fcc.gov/guides/low-power-broadcast-radio-stations#UNLICENSED

I don't recall the details offhand, but power limits are specified in
field strength and translate to only a few mW of TX power.

-p.
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