sloper trap

Petlowany Three-Band Burner Antenna - The Petlowany Three-Band Burner is a simple, low-cost, trapless short vertical antenna which amazingly works on three HF bands (20, 15 and 10 meters). This web page contains pictures, performance data, and enough construction details so you can homebrew your own.

Trapped dipole for 40-80-160 meters  ^pop - Build a space efficient trapped dipole antenna for 40-80-160 meter bands using RG-58 and PVC pipe by W8NX

A Reduced Half- sloper for 160 meters - A half sloper antenna for 160 meter band Italian translation of a WD8DSB article appeared in a QST issue during 1998.

Dipole for 40 meters - Shortened dipole with traps for 40 meters band in portuguese

W3DZZ for 40 and 80 meter - Home made w3dzz antenna for 40 and 80 meters band

PY6CJ 80/40 meters dipole - A center feed trapped dipole for 80 and 40 meter band in spanish

Hex Array - 80/40 Meter Vertical - This page describes a homebrew 80/40 meter trap vertical antenna. Includes an interesting antenna raising system that allow easy setup and tuning.

Wire antenna with coaxial cable traps - This multiband antenna 10-80 meters is a home made project by I1BAY. Has been used for SOTA activations with great results. Traps are done with coax cable turns, dimensions are in the attached schema.

To Trap or Not to Trap - An interesting article on traps, pros and cons of trapping by W4RNL

Base Loaded 160M Half-Sloper Antenna - If you want an antenna resonoant on the 160 meters band this is a possible solution, but of course, need space.

Optimizing half-wave sloper arrays for 160 meters - This article presents a 160-meter variation of this family of antennas and, more importantly, a discussion of the details of how to get such a beast working really well.

Trap antennas, coaxial trap, coax dipole antenna loss resistance - Testing and comparison of traps and trap antennas

About trap antennas - Negatives sides of using trap antennas

Coaxial Traps for multiband antennas - A new perspective on the analysis and design of this popular antenna element. By Karl-Otto Müller, DG1MFT

Building Coaxial Traps - This page describes the design and construction materials W8WWV used to build a coaxial cable trap. A coaxial cable trap is a parallel resonant circuit that is usually inserted in an antenna element to enable multiband operation.

Multi Band Antenna Traps - These devices are called Traps, but they are actually more like frequency sensitive switches. They are parallel resonant, high Q, tuned circuits which provide a very high impedance at their frequency of resonance.

Trapped antennas - ARRL index of document about trapped antennas and notes on traps usage

TrapDip - This program let you design and performance of 2-band trapped dipole antennas including trap design.

CoaxTrap - This program let you design of antenna trap using length of coaxial line wound as solenoid on a coil former.

VE6YP CoaxTrap - 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

7 Mhz traps for W3DZZ

High Performance Wire Antennas - Popularity doesn't guarantee high antenna performance, disadvantages of trap antennas

RippleTech Electronics - Wide bandwidth Trapped Verticals and rotary dipoles, baluns, 40m/80m wire dipoles and accessories from Australia.

R7 Vertical Maintenance and Repair - How repair the traps, and then homebrew the rest of the antenna, including the matching box

Troubleshooting Traps - This article refers mainly to the old Cushcraft 1/4 wavelength AV series of antennas (12AVQ, 14AVQ etc) hence the references to radials. The R series (R5, R7 etc) are 1/2 wavelength antennas, and the radials are NOT 1/4 wavelength resonant.