Found some info (link below) while sniffing around - looks to be relevant ( pages 10-13 ) as it discusses the same MIF antenna design used on the NRF24 boards and the frequency is 2.4 GHz. Interesting read for newbies like me.
My interpretation of the data is that the best gain/sensitivity is in/from the direction that the leg at the end of the squiggle is pointing. Might do some open air testing when the rain stope and I work out how to extract received signal level info :|
https://www.infineon.com/assets/row/public/documents/cross-divisions/42/infineon-an91445-antenna-design-and-rf-layout-guidelines-applicationnotes-en.pdf?fileId=8ac78c8c7cdc391c017d073e054f6227&utm_source=cypress&utm_medium=referral&utm_campaign=202110_globe_en_all_integration-files&redirId=File_1_3_1152
