I just learned about these signal forums from a different signal forum that I use. It seems that there is (or was) a bigger concentration of cell hunters here. One of my main interests is being able to use apps on our devices to help collect more signal information that is around us everyday. It looks like Cellumap is represented here. Though, I will be slightly bias for LTE Discovery (Android-only app) because I'm the co-developer of it. So, I hope to be able to contribute to the community and help answer any questions about (and suggestions for) signal apps.