Effective Isotropically Radiated Power (EIRP) is one means of comparing the performance of a transmitting station.
An inefficient antenna can lead to very low EIRP, perhaps surprisingly low. Consider these four examples at 3.6MHz,
The following NEC-4.2 models give some insight.
QW vertical with 120 buried radials
Considered by so many experts to be the benchmark for a grounded monopole, here is a quarter wave vertical with 120 buried radials.
Above, 120 buried radials: GAIN=-1.8dBi, radiation efficiency=20.7%.
At 1kW RF input, EIRP=661W. Continue reading Turning 1kW into QRP