After reading about how good horizontal loops are for WSPR RXing, well, I put one up. At 550 feet long, and between 40-80 feet high, it is the largest thing I have every messed with.

How does it perform? For RXing, it vacuums up the electromagnetic sky like crazy. Attached is a simple chart of SWL spot reports from KB9AMG's site (http://mardie4.100webspace.net/2_way_wspr_reports/index.html).

For multi-band TXing, the loop is "not ideal." The little uBITX has to try really hard to push a few watts out into horrendously high SWRs on the upper bands. But some electrons seem to get into the sky, and the radio has not exploited. Yet.