I got the idea for these Lambda loops from the RSGB VHF/UHF handbook. It is made up of one wavelength of aluminum strap (easy to bend). 3/4 wave length in the circle, and 1/8 wave length bent toward the center for a matching stub. That makes a total of one wavelength. i.e. 3/4 wave length plus two parrallel 1/8 wavelengths.
I stacked the 5/8 wave length apart. Fed by 3/4 wave of 75 ohm coax to the top, and 1/4 wave to the bottom that is flipped upside down compared to the top loop.
Then the array is fed with 50 ohm coax.
While travelling out to East Texas on I-30 I quite often worked K5SW in Muskogee OK. I caught 2-meter E-skip several times on long drives while calling CQ in beacon mode.
The first one was in Steamboat Springs, and also worked the Baha, Peurto Rico, Cuba, and Aruba. All on E-skip.