80m straight half wave dipole gain versus height Elevation plots   Height 2 meters Max gain -2.5 dBi straight up. Very low gain "bush antenna". Height 5 meters Max gain 4.3 dBi straight up. Low gain NVIS antenna. Height 10 meters Max gain 7.0 dBi straight up. Good NVIS antenna. Height 15 meters Max gain 7.3 dBi straight up. Good NVIS antenna.   Height 20 meters Max gain 6.8 dBi at 75 degrees. Moderate NVIS antenna.   Height 25 meters Max gain 6.4 dBi at 50 degrees. Good medium range antenna.       Height 30 meters Max gain 6.6 dBi at 40 degrees. Poor NVIS, good medium range antenna.   Height 35 meters Max gain 7.2 dBi at 35 degrees. Bad NVIS, good medium range antenna.   Height 40 meters Max gain 7.9 dBi at 30 degrees. Very bad NVIS, good long range antenna.   Height 45 meters Max gain 8.5 dBi at 25 degrees. Very bad NVIS, good long range antenna. See 80m dipole impedance versus height here 2020-10-05 OH7SV Back to OH7SV project page