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Butterfly capacitors are hard to find, expensive but they can be home made by PY1AHD

The 40/60/80 is a portable loop that covers 80 meters with a high degree of compromise

A simple circuit to homebrew your own headset for the Yaesu FT-817

This antenna was designed to meet the requirements of a light body worn small magnetic loop covering all the frequencies continuously from 7 MHz to 29.4 MHz

HF pedestrian operation using loop antennas by PY1AHD

The Duracell DR 36 laptop battery can be easily find and supplies 12 volts X 4 amperes. The main advantages on this system are, the weight, size, quick battery changing and no stress to the FT 817 power connector by PY1AHD

The Coke Loop is a Small Magnetic Loop Antenna tuned by a trombone-style variable capacitor made with standard soda cans

A small magnetic loop ready for a hand held walk and talk operation by PY1AHD

An invisible magnetic loop antenna mounted under a table by PY1AHD

A QRP 900 grams hydraulic tuned small magnetic loop antenna by PY1AHD Alex.

The Pocket Loop is a small magnetic loop antenna designed for a carry anywhere operation, it disassembles in 33 centimeters pieces that can be carried even on an attach handbag.

Coupling the Duracell DR36 battery to the FT 817 The main advantages on this system are, the weight, size, quick battery changing and no stress to the FT 817 power connector

The performance of a small magnetic loop can be improved constructing it larger, thicker or both. The antenna is covering from 12 Megahertz to 32 megahertz and adding a 156 Pico farads ceramic capacitor it resonates on the 40 meters band. by PY1AHD

A motor tuned magnetic loop antenna that can work from 14 MHz to 30 MHz

Air conditioning soft copper tubes are perfect for loop construction. If you want to try a loop you must have an air variable capacitor or a vacuum variable capacitor. Article by PY1AHD