It is commonly known that greater antenna heights usually improve the performance of these point-point terrestrial paths. Here's a NEC study showing the relationship of receive antenna height AGL to its output signal.
Below is a graphic showing that an approximately linear relationship applies. That is, doubling the receive antenna height above ground ~doubles the r-f voltage existing across the output terminals of the receive antenna (other things equal).
Elevating the receive antenna sufficiently may provide more improvement than that, if it reduces the propagation losses resulting from obstructed paths such as possible from nearby buildings, hills, etc.