https://www.steeman.org/Antennas
RF Antenna Calculators
RF Antenna calculators. Multipurpose DIY antenna constructions and antenna calculators.
rf antennacalculators
https://www.dxzone.com/dx32488/vertical-antenna-calculator.html
Vertical Antenna Calculator - Antennas/Antenna Calculators | The DXZone
Use this online calculator to determine the length of a quarter-wave antenna from the frequency. Both metric and English units of measurement are supported.
vertical antennacalculatorantennas