Need Antenna experts on very-short, yet broadband antennas. Sorry for off-amsat-topic post, but some research students need:

Size: on the order of 3 feet or less Freq: 10 MHz BW: 500 KHz Range: 1 km between like antennas Power: say 10W?

We know how to make very short HF antennas, we know how to make broadband antennas, but we don't know how to make very short, very broadband antennas. Looked at some H field claims, but they seemed to be snake-oil salesmen.

Bob