FYI, This active loop is in use at K5AX, Tom's QTH and he likes it. Made by Wellbrook, UK. 73 de Mike/ FartyTwo http://www.wellbrook.uk.com/antennashop/index.php?route=product/product&product_id=34 its an active loop that rejects man made noise. Doesn’t do much for qrn, but works pretty good on 160, 80 and even 40-up.