mr. hammond. just to get me hands around it, appellant is saying that it's a mandatory requirement to do a calculation on the cumulative. do you guys disagree with that? >> no. i think that what is essential is that what you arrive at after doing the calculation is a conservative -- a very conservative calculation prior to the intent of being installed. in order to do that, you need ts are nearby transmitters or antennas. as mr. hammond pointed out, in order for a nearby antenna to contribute to the level of radio frequency energy, it needs to be proximal to the antenna that's being installed. the energy from the antenna does fall the inverse square law. every time you double the distance, there's about a 75% drop in the energy. these antennas being installed are direc directional. in order to be a contribution, you would need to have a an antenna has aligned with the direction, if you will, that the antenna is pointed out. these are low powered antennas being installed. we took the time to do bac