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At best, you'll achieve about a 2 to 2.5 dB increase of gain on one channel in a perfectly executed antenna stack. You will also narrow the beamwidth to about half of the original in the plane of the stack.
If your reception is on the ragged, bleeding edge, then stacking the antennas will make a slight difference, perhaps enough to justify the exercise, perhaps not.
Use identical-length sections of coax between each antenna and the reversed splitter.
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