I built one of 1.45m diameter loop with an electrically fully disconnected coupling loop of a 1/6th of the diameter of the main loop and a 250pF variable capacitor. It worked fine on 17, 20, 30 and 40m. I have even tuned it on 60m, althought never got to make a QSO on that band.
Reception is good and always extremely quiet and comfortable.
Used for SOTA on a couple of drive-on summits. Worked S2S with a VE2 activator on 20m CW with 5 watts from our Atlantic Ocean coast EA1/CR.
Also worked FO French Polinesia on 17m CW with 5 watts and the magloop in the balcony of my QTH in the Village near Pamplona.
Althought it’s clearly very impractical for the type of SOTA activations I like doing, I love this home built antena and I will add a small capacity variable capacitor in parallel and a special mechanism to ease the tuning operation for 1:1 SWR one of these days. But finding the time to do these simple projects is something I find extremely difficult in these days…
P.D. You can see it on my QRZ.com