Richard Harrison wrote:
Two close antennas fed the same signal in the same phase generally add
broadside to the plane containing the antennas and cancel at right
angles to the lobes containing the added signals.

One thought of interest is that the phasing for a phased
antenna system might be done at the input of one of the
amps, rather than having to manage high power. But I
wonder if two separate amps could maintain coherency
under all conditions of supply voltage, temperature,
humidity, etc.
--
73, Cecil http://www.qsl.net/w5dxp