Lex-Lutor wrote:
I'm interested in real results between this two antennas, urban
area, same
power, same high etc. Running circular we have only 50% of power,
compared
to normal dipole, but there are many positive feedbacks about
circular
polarization in urban area!

Very, very much not an urban setting, but West Virginia Public Radio
was exclusively horizontally polarized at most, if not all, their
dozen mountain top transmitters. The chief emgineer contended it
worked better in the mountainous terrain. Their situation might have
assumed a fixed transmitter power out, thus the circular would result
in half the ERP (per polarization).

I note that they have recently obtained construction permits to
convert to circular. Perhaps they are buying new transmitters - which
will have much higher efficiency. This way the power bill and wires
up the mountain need not change (much) to get the higher transmitter
output needed to maintain the same horixontal ERP when going to
circular.