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I built my own groundplane antenna and tested the performance for Meshtastic use around 869MHz. Also a quick introduction to simple settings for Nano VNA network analyser.
Some online antenna calculators:
m0ukd.com/calculators/quarter...
www.changpuak.ch/electronics/...
For more info about Meshtastic activity in and around Brighton, UK see
/ 3696312513946679
A much larger Facebook group is Meshtastic UK
/ 625434626178266