The Coax trap program computes design parameters for the construction of coaxial traps for HF usage. Typically these are constructed from PVC tube and RG58/59 coax
To Trap or Not to Trap
Bootstrap coax traps for antennas
trap antennas coaxial trap coax dipole antenna loss resistance
How antenna traps work - IW5EDI Simone - Ham-Radio
Antenna Trap Calculator - Resource Detail - The DXZone.com
ON7EQ COAX TRAPS
Building Coaxial Traps
20/40 Meter Short Coax Trap Dipole Antenna - Resource Detail - The DXZone.com