CM Half size G5RV CM Modelled by Roger Walker, GW6HRU, for low frequencies, gets a feedpoint is < 1/1000 wavelength error CM CM G5RV = 102.5ft/31.26m total top wire + 30.6ft/9.32m feeder wire - https://www.hamuniverse.com/g5rv.html CM Half G5RV = 15.5m/50'10" total top wire + 4.6m/15'1" open wire CM ZS6BKW = 93.5ft/28.5m 43.6ft/13.3m - https://www.wireantennas.co.uk/pdf/zs6bkw-antenna-from-the-horses-mouth-by-g0gsf.pdf CM W0BTU= 93ft/28.34m total top wire + 39.8ft/12.13m feeder wire - https://www.dxzone.com/the-truth-about-the-g5rv-antenna/ CM CM UK Bandplan reminder: CM Min Max Mid WL 29/13.3 28.5/13 29/13 CM 7.000 7.200 7.100 42.22 3.62 2.19 5.38 3.4 4.6 2.88 CM 10.100 10.150 10.125 29.61 CM 14.000 14.350 14.175 21.15 3.7 11.5 1.5 4.71 1.97 7.49 CM 18.068 18.168 18.118 16.55 1.87 1.48 4.56 3.2 3.15 2.21 CM 21.000 21.450 21.225 14.12 CM 24.890 24.990 24.940 12.02 5.8 7.81 1.29 1.27 2.5 3.7 CM 28.000 29.700 28.850 10.39 10.05 4.85 18.6 1.6 14.8 2.24 CM 50.000 52.000 51.000 5.88 CE CM These can be changed SY H=15 'Top height SY B=0.50 'Min base height - will move feeded diagonally to keep the bottom end it at least this above the ground SY W=15.5 'Top wire total length SY F=4.6 'Feed wire length - will be vertical if (H-B)>F, otherwise will move feedpoint away from vert to get length SY G=0.02 'Feeder width SY R=0.001 'Wire radius CM These are calulated from the previous values SY CL=(W-G)/2 'Length of each top wire (minus feedwire gap) SY CH=(H-B)-F 'Height if vertical CM Use weird sgn/abs to get 0/1 so we can simulate if statement SY CS=(1-sgn((abs(CH)-0.001)+CH))/2 'Get 0/1 for is it higher than the min height or not (Avoid rounding issues) SY CZ=CS*B+(1-CS)*(H-F) '((H-B)