Fabio IZ7NLJ on Twitter: "3.5 and 7 MHz Dipole. Using coax traps and insulated wire this inverted dipole antenna by one single 50 ohm coaxcable. #hamr #hamradio https://t.co/s125pck202" / Twitter
An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters
antenna construction - 3 Band (80-40-20 Meter) Fan Dipole Tuning Question - Amateur Radio Stack Exchange