ORIGINAL: alan0899
ORIGINAL: RCKen
There are two antennas for the receiver and they must be mounted where they are aligned 90° to each other.
Ken
G'day Mate,
And even that, is not critical.
Nah, they just had some space on a page in the manual they needed to fill with something.

Doesn't need to be EXACTLY 90 degrees but that is optimal.