Some people call them "clover leaf" antennas as that is what they look like. These are horizontally polarised omni-directional antennas for 2m (in my case). Although I am not sure of the radiation pattern, it is quite a good match on 70cm too.
Mine has been up for several years now and I am very pleased with it. Only today my 2.5W FT8 TX signal was copied (again) in Eire and Germany. It has a few dB of gain in all directions. For my sort of operating it is ideal and it gets used for UKAC sessions on 2m and 70cm SSB as well as for FT8. Some may want the extra gain and directionality afforded by a beam, but beams need rotators.
See https://sites.google.com/site/g3xbmqrp3/antennas/bigwheel
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