In 800 mhz, the effective radiating power is 12 watts, leaving the ground at 18 watts.
Since these are "line of sight" antennas, unless you are up 120 feet off the ground, you are not in the direct path of them - and if you were, 8 to 12 watts is not enough to cause a problem...........
Ummm, it's true that microwave operates on the principle of "line of sight." If you're over the horizon, you're screwed, or if your signal can't bounce off of a building or mountain which does have line of sight, you're also screwed. On the other hand, I have a hard time believing that a transmit antenna meant to blanket square miles of territory at ground level (where the cars and people are) is so point-to-point that it doesn't reach the ground. Only a microwave link to a specific receiving station would operate in that fashion. I could see where tower-to-tower network communications would operate that way but if my handheld cellphone works in my basement, how is it that that transmit antenna is only hitting something at 120 feet?
8 to 12 watts is not enough to cause a problem...........
In the interests of reasonableness I would clarify that. Presuming this is a highly directional (as in a beam, dish, reflector, or horn type of antenna) I, personally, would prefer not to spend much time at baseball throwing distance of that antenna at 1900mhz if directly in its path. At higher frequencies, I would like it even less. A low gain, omni-directional antenna is another story.