You're going to need to be a lot more explicit about the kind of signal you are trying to measure when you reference "signal tower." Also, what's a signal battery?
You also might get a quicker answer on the BlindTech group. -- Brian
I worry a lot. . . I worry that no matter how cynical you become it's never enough to keep up.
~ Trudy, in Jane Wagner's "Search for Signs of Intelligent Life in the Universe"