Dual-band cell signal amplification... Can you help?

Question

My company has moved into a new building (32256 ZIP). Unfortunately we've found that the solid construction has reduced cell phone signals in the building to zero. Once we step outside, cell service immediately returns... for both 850 MHz & 1900 MHz bands.

I'm looking to install a signal amplifying system with inside dome antennas to restore service from all carriers (AT&T, Sprint, T-Mobile, NexTel, Verizon, etc.) to my clients in the building.

Can you recommend a set-up for me (including part brands & models?)

I'm really curious if I should use separate roof-top antennas and separate amps for the two bands, or if I should use a dual-band antenna with a dual band amp. Omni-directional or directional?

This is a first for me. I've done a lot of research, but any bit of info you can provide sure will be appreciated.

Answer 1

Well that's a tall order!; you are actually considering several bands 800 mhz,1200mhz,as well as 1900 mhz. I think what would be simple, is just run a couple antennas and feed cable down through the walls feed to the internal part of the building. Attach antennas in parallel on the same cable inside a breakroom or something like that. Do not use an amplifier becuase it might cause interference problems with other cell bands.

Answer 2

I used to work for a 2-way radio outfit and we installed cell repeaters in several buildings due to metal roofs or other dense construction.  They worked great and the customers were very happy.  There was no problem with the amplifiers that came with these systems.  You shouldn't need separate antennas or amps.  We just put a standard antenna above the false ceiling.  No need for anything fancy like a dome for the antenna.  The link below leads to one source.  There are others.  You can search the web yourself or just check with some local 2-way radio shops.