Not sure I understand. Why not use sections of different impedance coax
to raise the effective antenna impedance of each antenna to 100 Ohms,
then use different lengths of 50 Ohm coax from the "Tee" adapter to
these matching sections. The delay difference will cause the pattern to
be steered in some direction. I assume you will be using crossed
dipoles. When the two 100 Ohm antennas are connected together through
the Tee, it will result in a system impedance of 50 Ohms. As long as
you use resonant dipoles, current and voltage will be in phase in its
respective dipole, so the impedance will not change. You are only
providing a phase difference between the two dipoles by changing the
path length the signals travel from the transmitter to each antenna. It
should work. We basically did this when I worked at the U.S. Navy ELF
transmitter site.


Steve Nosko wrote:
"...easy way ..."? To change the phase, yes.... To change the pattern,
Probably not. The impedance changes with the phase relationship. Antennas
feed power to each other. Try searching for "Phased arrays".