Homemade Antenna

I am looking for information on building a home made antenna. Months ago I
found myself quite accidentally at an ultralight club meeting in San Diego.
After the meeting they were having an antenna workshop to build some
antennas for their ultralights.

The antennas were made out of coax cable and a BNC connector. It was more
of an L configuration than a J-pole. If I remember correctly, they took
several feed of coax, stripped off shielding and insultation on some of the
long leg as the radiator and connected the other end to a tee BNC connector.
On the branch of the BNC connector, they used about 2-in of coax. The
feeder line when into the other "straight" side of the BNC connector.
(Initially they weren't using the BNC connector, this was an 'improvement'
in manufacturing because it was difficult to solder the copper and keep the
shielding separate, etc.)

I know that is a fairly poor description but, does anybody know what I am
talking about and where I can get plans?

Thanks,
Carl