"gareth" wrote in message ...

wrote in message
...
On Thursday, September 10, 2015 at 5:27:41 AM UTC-5, gareth wrote:
What is the nature of free space such that it requires antennae to be at
least 1/4 wave
before accepting radiation efficiently?

Ding, ding, ding. Totally false statement.
Don't pass go, don't collect $200.

# Convince yourself by calculating the retarded potential from a far field
# when
# the same field strength comes from a dipole and when it comes from a short
# antenna.
#You find that there has to be more power fed into the short antenna
# (irrespective of
# feed impedances and ohmic resistances) to achieve that same field
strength.

Well, I don't know what you are calling "retarded potential".

At any rate, if the radiated power is equal for two different antennas, why
would the field strength be different, except as related to pattern
differences?