Antenna length for 868 and 433 MHz

[rharte]

@LoRaTracker

My conclusion after around a year of testing is that the theoretical calculated length, whilst a good starting point, is very rarely the optimum length for maximum radiated signal.

We have the same observation. If you hook up a quarter wavelength ‘simple wire’ antenna to an analyser to optimise it for VSWR you usually see that the actual length for optimal VSWR is significantly shorter than the theoretical quarter wavelength.