I've never done it, but from what I understand in order to increase gain with two antennas, you have to use identical antennas, with equal lengths of coax into the combiner, and the antennas have to mounted a certain distance apart (not sure what distance) and be pointing in the same direction.
I do know you cannot combine two antennas and have them pointing in two different directions.
You best bet would be a antenna rotor.
On September 20, 2006 at 13:30, jimdoo said...
How 2 combine two uhf antennas:
Can someone please help me with using two uhf antennas
simultaneously? I use a CM 4228 on the roof for CBC and
a RS bowtie antenna inside for the Buffalo locals. How
can I use these two antennas together? I am getting some
decent reception of Fox and PBS from the back of the rooftop
antenna however I get better results from the indoor bowtie
for the locals.