[amsat-bb] Very-short Antenna experts?

[Robert Bruninga]

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