The AOR LA320 is an excellent loop that I have used. Its coverage is
1.6-15mhz. Which may or may not fit your needs. AOR also has a new one thats
called the LA-350 Its coverage is 3-30mhz. I've never tried it but if its
as good as the 320 you will be pleased.
http://www.universal-radio.com/catalog/sw_ant/1806.html

I had a Quantum loop once that was an excellent performer too.

Brian
--
Never under estimate the stimulation of eccentricity.

Brian's Radio Universe
http://webpages.charter.net/brianehill/