Four resonant points of multi-band fan dipole antenna on NanoVNA!

See the four resonant points of multi-band fan dipole antenna on NanoVNA! They are for 40, 20, 15 and 10m amateur radio bands. The antenna has elements only for 40, 20 and 10m bands. It works on 15m as third harmonic of 40m, that is 21 MHz with 7 MHz center fed half-wave dipole elements. Antenna has been mounted in an inverted V fashion due to space constraints. Coaxial cable is 15m of RG213 and there is a 1:1 current balun at feedpoint. Height of antenna apex from ground is about 10m.