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My Hula Hoop Ground Plane Vertical Antenna is an efficient antenna that is easy to build and align.
This J-pole design works very well if you tune it up properly. An SWR meter is a must for setting up this antenna.
If you want to transmit with higher power, find a better quality transmitter such as the Free Radio Berkeley Mono PLL kit, and build my circuit for an FM Stereo generator (above).
Here are some tips on squeezing the most performance out of an FM10a kit:
Five Essential mods for the Ramsey FM10a
Also see my constant temperature circuit, can help to reduce frequency drift in transmitters like the FM10a. Better yet, just get a PLL-based transmitter that does not have the frequency drift problem.
Audio Mixer for the Ramsey FM10a in GIF format
Description of the FM10a Audio Mixer