Hi is ACGPSA usable on the outside of car?
I also bought 2 generic SMA 9dBi antennas which are definitely indoor ones, though they have magnets so I could attach them to roof. What can happen to indoor antenna when used outdoor? Will it corrode or something? Can it damage LtAP?
Yes, of course it is for car roof.
Just remember that this is an active antenna. GPS antennas should be attached only when unit is turned off. If you accidentaly short the connector, while attaching, this can cause problems.