"Wimpie" wrote in message
...
The formula contains f^4, when you halve the frequency, the radiation
drops to 6.25%. This is the reason that at low frequency the EM radiation
is negligible in most cases. This behavior is also the reason that you
need large antennas to produce low frequency EM radiation fields with
useful efficiency.

Watch out for the redneck troll lurking beneath the rickety-rackety bridge!