Anyone know how to build a Cell Phone Repeater or Booster for a tower?
I've done quite a bit of searching on this already, and have found several methods to improve the cell phone antenna, or the coffee can method, but what I'd really like is something that can work for ALL of our cell phones (that are with different cell carriers), and therefore (as I understand it), can be on different frequencies. The only thing I could find were devices that were out of the box ready and at a hefty price.
Does anyone have any advice? or can point me in the right direction in order to build something like this that will work?
Edit: Let me clarify that the intended purpose isn't to be able to contact 'emergency services' from camp. We're a few hours from the nearest town and it isn't conducive to 'sit and wait' for help to arrive. Our group has been extremely safe, competent and self sufficient in that area for more than 30 years. Without getting too personal, we have an "in town" family member with a serious illness. If there were ever a reason, we'd like to be able to reach family at the camp to let them know that they needed to return home.