Think I found a nice antenna:

http://www.bellscb.com/products/antennas/solarcon/solarcon_A99_antenna.htm

A Solarcon A-99. 18 feet in 3 six-foot sections. Omnidirectional. Shppg wt 6 pounds. So, this thing is made to minimize wind resistance. Wouldn't need guy wires. That's an issue because of livestock tripping over them and people decapitating themselves. I could mount a mast on the side of the metal carport canopy (secure it to one of the ribs up high, where it bends), then this thing would extend another 18 feet.

These people make a 24-footer too. For the longer wavelengths.