Antenna Traps
Links
HF Trap Antennas
How antenna traps work
An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters
Multirange Trap Antennas
Traps - Mainteannce, Checking and Repair
How Well Does A Trap Dipole Work
70 Antenna Ideas