As an interesting bar discussion, I'd say the answer is: a very large hole, aimed at the nearest cell tower. Think of visible light. If you have NO windows or openings in the metal building, how big a hole would you make to let in enough light to see properly all over the inside?
But for a serious answer, there is a good type of solution. Two antennas (inside and out) is not good enough - the signal strength you'd get from that is VERY weak. But a system that includes a repeater amplifier in between will do this job very well. One company that has lots of solutions is Wilson Electronics, here:
http://www.wilsonelectronics.com/store/index/category/39/building-solutions
For example, there are systems that involve an external antenna, an amp, and a type of internal antenna that behaves like a "leaky cable" you run around the building and it distributes the signals everywhere.
But for a serious answer, there is a good type of solution. Two antennas (inside and out) is not good enough - the signal strength you'd get from that is VERY weak. But a system that includes a repeater amplifier in between will do this job very well. One company that has lots of solutions is Wilson Electronics, here:
http://www.wilsonelectronics.com/store/index/category/39/building-solutions
For example, there are systems that involve an external antenna, an amp, and a type of internal antenna that behaves like a "leaky cable" you run around the building and it distributes the signals everywhere.
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