40 Meter Magnetic Loop Antenna Designs and Projects
Find plans and construction details for building efficient 40 meter magnetic loop antennas for your ham radio station.
Magnetic loop antennas for the 40-meter band offer a compact solution for hams with limited space or those operating portable. These antennas are known for their small footprint and often impressive performance, especially when compared to full-sized wire antennas. Many operators find them ideal for apartment living, HOA-restricted properties, or for quick deployment during field operations, allowing effective QSOs on 7 MHz.
This category features various magnetic loop antenna projects, from simple designs using coaxial cable to more robust builds with aluminum conduit. Operators can find detailed construction plans for portable multi-band loops, like those covering 20, 30, and 40 meters, or dedicated 40-meter designs. Several articles provide insights into tuning methods and practical considerations for building small transmitting loops, including options for car-mounted setups.
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A coaxial cable tuneable magnetic loop antenna for 7MHz. This experimental antenna does not require a tuning capacitor -
Able to cover all frequencies between 3.5 and about 10 MHz, the loop described here is directional, does not require a radial system, and stands just 1.8 metres tall. The antenna can be put together in a short time and is cheap by Peter Parker VK3YE ex VK1PK -
Described here is a simple multi-band magnetic loop antenna designed for 20, 30 and 40 metres, but by changing the overall length of the wire coverage of other bands is feasible -
Article on a small magnetic loop antenna for forty meters band by Ben Smith -
A Mississippi Style 40 meter magnetic loop made from available aluminum conduit, this antenna will not disappoint by Ken Holland, K9FV -
A page about a Magnetic loop antenna project for the 40 meters band, includes nice pictures and history of construction -
Evolution of a project of a small magnetic loop resonating from 80 to 40 meters -
A simple multi-band magnetic loop antenna designed for 20, 30 and 40 metres, made from 16 feet of RG58 coax cable. The performance is impressive for its size but not meant to replace a Yagi. The antenna features a tuning head, matching unit, tuning capacitors, band change switch, and matching transformer. The feedpoint is at the bottom of the loop. The document provides detailed instructions on assembly and operation. -
A well documented article on a small magnetic loop antenna for the 40 meters band -
A magnetic loop antenna for 7 Mhz by ZL1BJQ -
Article about small magnetic loop antennas with notes on realization of magnetic loops for several HF bands and the six meter band