[timgr]

You can use two antennas if you put them on an A/B switch. This would give you a similar result to using two tuners, but at lower cost. The antennas still have to be far enough apart on the mast so they don't couple electrically. The problem comes from trying to combine the two feeds.

Combining antennas that are not pointing in the same direction is unpredictable. The signal that each antenna receives will be different in phase and amplitude, because each "sees" signal coming from different directions. Channels may sum (in phase), they may cancel (out of phase), or they may be noisy ... it's nigh on impossible to predict.

There are specific configurations of multiple antennas that will work reliably, but they must be identical antennae arranged in a precisely spaced array.

If you want to try two antennas pointing in different directions, you can, but you may not get the results you want. Google "stacked antennas" for more reading.

There are a couple of other multidirectional options. The Antennas Direct DB8e has two panels, and they can be aimed in different directions. Here, the antenna is designed with two identical arrays at a pre-calculated and fixed distance from each other, and it works. Won't be as sensitive as both panels aimed the same direction though.

Another possibility is a bowtie antenna like the DB4e with the reflector removed, will receive from front and back. Again, won't be as sensitive to the front, but it won't block signals from the rear.