I'm experimenting with low frequencies, but due to the inherent nature of LF, I strive for more transmit power and bigger antennas.
Now of course I want to comply with regulations, which allow (in my country) an average exposure of 80 V/m at this frequency.
If I'd have a T-antenna that was 15m high and 20m wide. How do I calculate/estimate at which distance I would expect this field strength? Let's say 100W PEP, and an estimated radiated power of 10 mW EIRP.
The formula that I've found applies only to the far-field, I think: https://ham.stackexchange.com/a/10078/16455