"Slinky" Helical Magnetic Loop Antenna by N4SPP
A standard Slinky® is a toy made from a flexible 90-turn metal spring. It has diameter of 2¾ inch (≈7 cm). Each Slinky contains about 67 feet (20 m) of flat steel wire (1/10 inch wide), and weighs approximately ½ pound (225 gram).
https://www.nonstopsystems.com/radio/frank_radio_antenna_magloop-slinky.htm

4-Band Cola Antenna (20-17-15-10m) by G8ODE
Deploying a centre fed open loop half-wave dipole in a square shape lowers the impedance to around 8-12ohms.
https://rsars.files.wordpress.com/2013/01/4-band-20-17-15-10m-cola-g8ode-iss-1-0.pdf

40m-10m Delta Loop Antenna by GU3WHN
This simple broad band antenna is easy to build, has gain similar to that of a dipole and is tolerant of nearby objects. It can be erected in almost any configuration provided the wires are well separated otherwise it acts as a singe band broadband dipole.
https://rsars.files.wordpress.com/2013/01/40m-10m-delta-loop-antenna-gu3whn-iss-1-3.pdf

A Magnetic Loop Antenna by G3YCC
Various articles have appeared describing magnetic loops for HF use, some with complicated methods of remote tuning and the antenna can be quite a useful and interesting project.
http://www.zerobeat.net/g3ycc/loop.htm

A Magnetic Loop Antenna for Shortwave Listening (SWL) by KR1ST
The small single turn magnetic loop (SSTML) antenna consists of a single winding inductor, about 3 feet (1 meter) in diameter, and a tuning capacitor.
http://www.kr1st.com/swlloop.htm

Foldable Mag Loop 40m-17m by PAØWIT
The small HF magnetic loop is made from standard aluminium profile purchased from a hardware store. The six main sections are 67cm (26.4") long, this length maximises the number of pieces that can be cut from two 2.5m (8.25 ft) lengths of aluminium square tube.
https://rsars.files.wordpress.com/2013/01/40m-17m-foldable-mag-loop-pa0wit-iss-1-31.pdf

HF Kite-shaped Loop Vertical by W6NBC
... I have found a way to build a no-radial, small-footprint, ground-mounted vertical that outperforms other verticals of the same size
http://w6nbc.com/articles/2019-07QSTHFkiteantenna.pdf

HF Receiving Loop by VK2ZAY
This experiment was inspired by Peter VK2TPM's receiving loop experiments for 80 metres. My loop is a bit smaller than Peter's, a single turn, the circumference is 4 metres + a little for the aligator clip lead, made from medium gauge mains lamp cord ("zipcord" for the yanks).
http://www.vk2zay.net/article/141

Magnetic Loop Antenna by DL1GSJ
This is the construction of my own indoor magnetic loop. The antenna works fine on the bands from 20m to 10m. It was completely built from junk.
https://www.qsl.net/dl1gsj/html/magn.html

Magnetic Loop Antenna by LA6NCA
For communications from 20 to 200 km is this small loop better or as good as a full size field mounted dipole. An HF whip antenna is also mounted on the car. The magnetic loop is fare better than the whip antenna.
http://www.la6nca.net/homebrew/loop/index.htm

Magnetic loop antenna for 160 to 15 metres by VK3YE
October 1997's Novice Notes looked at compact antennas that amateurs use to operate from confined locations. The smallest antenna described for 80 metres was a magnetic loop. This article provides all the details needed to build your own.
https://vk3ye.com/projects/projmag.htm

Magnetic Loop With Capacitive Load For 30-10m by HB9MTN
A light and portable Magnetic Loop Antenna with improved Bandwidth and Performance
https://www.qsl.net/hb9mtn/hb9mtn_adf_loop.html

Magnetic antennas by DL7JV
Building of antennas could be expensive, on a weekend and the market was closed. The problem was to build the circle. And then still the condenser with high tension strain. There the antenna in the room to be operated should did I first without the remote control.
https://www.qsl.net/dl7jv/e.mag.htm

Multiband Cubical Quad by EI7BA
My Quad covers eight bands at present, 30m through10m on HF, and also 6m, and the European 4m band. The original plan was for a five band Quad, but as the arms were longer than required for 20m, I used the extra length to accommodate an extra band.
https://www.qsl.net/ei7ba/Cubical%20Quad.htm

Multiband Deltaloop by DL2HCB
After a Qth change last year, I was fortunate to get permission for an outside antenna. The new antenna was built with the following considerations in mind: At least 10 - 20m coverage; Open wire feed to simplify matching ...
http://www.zerobeat.net/g3ycc/dl2hcb.htm

Multiband Vertical Loop Antenna 10, 14, 21, 28 MHz by VE2AZX
The wave emitted by the vertical loop may be polarized vertical or horizontal depending on the feedpoint location.
http://www.ve2azx.net/technical/AntenneLoop21MHz-3EN.pdf

My Magnetic Loop Antenna by KR1ST
I built this antenna when I lived in an apartment complex which does not allow antennas and where I had no real estate to play with.
http://www.kr1st.com/magloop.htm

PA3GZK's Breedband Actieve Loop Ontvanger Antenne door PAØFRI
PA3GZK heeft een flink aantal actieve antennes in allerlei vormen (na)gebouwd en er uitgebreid mee geëxperimenteerd. De hier beschreven antenne gaf veruit de beste resultaten en is het resultaat van vele testen met allerlei schakelingen en systemen.
https://pa0fri.home.xs4all.nl/Ant/Active%20antenna/Active%20receiving%20%20loop%20antenna.htm

Packing Crate Antenna by SMØVPO
I have been placed in a situation where a landlord denied permission to erect an antenna. Any form of antenna was unreasonable, even a white-painted broom handle caused interference!!
http://sm0vpo.altervista.org/antennas/crate.htm

Pedestrian mobile magnetic loop for 40 to 10 metres by VK3YE
I've described a few magnetic loops for HF pedestrian mobile. This one is my favourite. It's light and robust enough to use for hours at a time yet performs well on the busiest HF bands.
https://vk3ye.com/projects/projmal.htm

Pedestrian mobile magnetic loop for 20 to 6 metres by VK3YE
In 2012 I made a 40 centimetre diameter magnetic loop antenna for pedestrian mobile. Covering 21 to 50 MHz.
I've since made a SummerLoop II using parts from the Original.
https://vk3ye.com/projects/projsum.htm

Portable Mag Loop For 40m-10m by G8ODE
The square loop has 60cm sides and, with the capacitor, tunes from 7.0-30 MHz. The Faraday coupling loop is approximately 1/5 (2.4m + 10cm wire tails) of the circumference of the loop. It is better to make the loop slightlylonger and trim for an SWR of 1:1 (ref 50 ohms) on the lowest band.
https://rsars.files.wordpress.com/2013/01/portable-hf-loop-40-10m-g8ode-iss-1-31.pdf

Portable Small "Magnetic" Transmitting Loop for 40-17 mtrs by N4SPP
Mid-2012 I acquired a portable QRP rig: a Yeasu FT-817ND (HF + 2m + 70cm, 5 watt). So I needed a portable loop (40-20 or 40-10). Such loops are available commercially for several hundred euros/dollars. You can make one yourself for a fraction of that price.
https://www.nonstopsystems.com/radio/frank_radio_antenna_magloop-small.htm

Raamantenne voor de 160, 80, 40, en de 20 meterband door PE1KQP
Het concept van deze antenne is niet nieuw, maar door de goede verkrijgbaarheid en lage prijs van de zogenaamde hengelmasten ( 12 m lang ) is het mogelijk om een veelzijdige vakantie antenne te maken.
http://pa0ebc.nl/pe1kqp/indexa27f.html?page=raamantenne

Simple RG213 Mag Loop (30m-15m) by G8ODE
Its amazing what you can do with a bit of spare coax and an old vintage brass 130PF capacitor with 1mm spacing. During the Lighthouse weekend, when the local QRN was really bad, this simple loop was constructed and performed remarkably well.
https://rsars.files.wordpress.com/2013/01/simple-rg213-hf-loop-30m-15m-g8ode-iss-1-31.pdf

SMØVPO-style Spiral Loop Antennas by N4SPP
This antenna is very compact: ≈ 120x120 cm (4x4 ft). It is basically a transformer loop antenna: it consists of a multi-turn tuned loop and a small feed loop. The tuned loop is spiral-wound and square, has about ¼ λ total wire length.
https://www.nonstopsystems.com/radio/frank_radio_antenna_SM0VPO.htm

Small "Magnetic" Transmitting Loop for 80-20 mtrs by N4SPP
Print page button This page provides a top-level description of Small Transmitting Loop (STL) antennas (a.k.a. "Magnetic Loop Antenna", MLA), and my two versions of such an antenna for 80 mtrs and up.
https://www.nonstopsystems.com/radio/frank_radio_antenna_magloop.htm

The G4ILO Wonder Loop by G4ILO
The G4ILO Wonder Loop is an inexpensive, easy to make magnetic loop antenna that covers five HF bands, 40m through 15m. It is designed for portability, and can be assembled or disassembled in about a minute.
http://www.g4ilo.com/wonder-loop.html

The Rockloop by W9SCH
W9SCH described this small loop in Sprat 60 and it has proved useful to the QRPer, ... It is basically a variant of the usual magnetic loop, using a toroid balun to get a reasonable match on the three bands.
http://www.zerobeat.net/g3ycc/rock.htm

W9SCH's Rockloop Antenna by DL1GSJ
Years ago I started experimenting on magnetic loops & Co; I like the idea of narrow resonant aerials. When I saw the rockloop I never believed it might work (Ohmic resistance of the wire).
http://www.qsl.net/dl1gsj/html/rockloop.html

Wide Band Active Loop Receiving Antenna by PA3GZK
If one has no place for an antenna of sufficient length for receiving radio signals, a small active antenna may be the solution and you may find on the Internet a lot of related publications.
https://pa0fri.home.xs4all.nl/Ant/Active%20antenna/Active%20receiving%20%20loop%20antenna%20eng.htm