Where is the antenna and how much gain does it have? Assuming and omni-directional antenna with approx 3 dBi gain, at 10 feet, you should be well below the maximum exposure level.
Also, the current generation of handheld cell phones are limited to approx 200mw max radiated power and only use...
Some recommendations and thoughts:
1. Home run all the cables to a common point and install a suitable splitter there. If possible locate it inside where AC power is available, so you can install an a signal amplifier if neeeded.
2. Use a good grade of RG-6 with good shielding. Quad shield is...