Well you could run the 3" heliax from the antenna entrance panel [That serves your R-390(*)'s] out to the 2-30MHz, dual-mode, omnidirectional antenna that you use to listen to the world of HF. It would deliver more signal than that lossy 50 year-old, sun baked, RG-58 that you're using now. RICH @B> } Ah, what kind of R-390 takes 3 inch heliax? Is this relevant? Bill Hawkins