[TowerTalk] looking for active antenna design

[Jim Lux]

For a research project, I'm looking for some designs for a HF active 
receive antenna as a starting point.  In particular, I'd be interested in 
schematics and any construction idiosyncracies.  Ideally, it should work 
down to 1.8 MHz, and I'd be interested in techniques used to deal with 
strong interfering signals (e.g. broadcast AM), such as switched input 
filters, etc.

Jim