@AC0OB OK ... I know you're right about the roller inductor after thinking it through. I know from static/lightning coils I use on open-wire feeder the inductance is high at 340uH or higher and never had a problem loading any of my gear at amateur frequencies, so yes a roller would not have enough inductance and be problematic for any tank circuit. OK ... toroid and coax center conductor it is. Much simpler, LOL. Dennis .... grrr ... ya got me all excited. I thought I finally found a use for those rollers!!!