My experience with the 2.4GHz tempest stuff was that I found the range to be surprisingly excellent.
I would be outside the building and quite a ways away from the base station (using the base antenna) before I experienced dropouts.
Line of sight, I never had enough distance to get outside the coverage. I found it equal to, and in some cases better than, what I would normally expect from a BTR-800 system.
That being said, I don't know that the RF performance in the TR24 series is necessarily on par with the Tempest system, having never used it myself.