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Hello !
Question in the title...
Can anybody give me some info about these antenas ?
73's
Gilles FM5AD

Gilles,

HF horizontal loops are usually fairly large antennas. Typically cut
to 1005/f(MHz) for circumference in feet. They are often fed with
open wire transmission line using balanced antenna tuners. This makes
them capable of operation over a range of up to 3 octaves. Their
radiation pattern depends on whether they are operating on their
fundamental frequency, a harmonic or somewhere in between. Take off
angle (and best reception angle) is dependent upon height above
ground. They do have a reputation for being relatively low noise. I
say relatively because when they are mounted at a height less than
1/4 wavelength above ground they have a predominantly "straight up"
radiation pattern which makes them very efficient at picking up
atmospheric noise.

Hope this helps you.

73,

'Bear' NH7SR