Abstract: Described are various embodiments of a line-of-sight (LoS) sensor mounting system and method. In one such embodiment, a LoS sensor mounting system is described for operatively mounting a LoS receiver and LoS transmitter on a structure having opposed external walls, comprising a mounting plate and an alignment jig comprising a mounting plate engagement structure and an alignment barrel dimensioned. The alignment barrel is dimensioned to receive an aperture-forming tool operable therethrough along a LoS axis so to form a counterpart external wall LoS aperture within an opposed external wall.