Even parallelling might not put you in the optimum part of the signal (but as a simple default, you're better off with the TX and RX antennas im parallel then perpendicular). Going back to my school days (yes Bill - radio HAD been invented), I remember the instructor comparing antenna radiation patern for a vertical antenna to a water sprinkler (the simple hose end type). Not much if anything straight up - but a donut like pattern if viewed from the side. Antenna gain affects how "steep" of "shallow" the pattern is also. Google "RF angle of radiation" some time if you're REALLY bored (why I was a power engineer and not an RF engineer)
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