I build a 20.5’ (6.25m) vertical antenna for portable ham radio #hamradio #portablehamradio #hamradioantenna
Link to website explaining random wire antenna lengths:
https://ve3ips.wordpress.com/2021/11/02/the-best-random-wire-antenna-lengthsrandom-wire-lengths-you-should-and-should-not-use-jack-ve3eed-sk/