With 30 years of experience in the RF industry and having an FCC commercial license for many years and BTW, I was the Equipment Engineering Manager, NYNEX Mobile in Pearl River at Blue Hill Plaza in the old days ( 1985 - 1989 ), I can offer a few simple suggestions:
If the wireless router has the capability (e.g. CISCO), make sure the dual antenna ports are split, as to: one is the Rx antenna, the other is the Tx antenna.
Make sure the Tx and Rx antennae are seperated by at least 6 feet to reduce RFI. Use coaxial cable with BNC connectors, soldered type is the best.
The Rx antenna should be placed in a central location (e.g. in the Hung Ceiling), away from any steel girders and concrete (concrete often contains rebar, which is steel). Look for Good Line of Sight. 2.7GHz is a very directional signal band.
Restrict the use of cellular. Although we are in the 800MHz band, harmonics can reek havoc. We used to call the WTC - Hetrodyne City.
If available, a spectrum analyzer should be used for the best Received Signal Strength Indicator reading from the workstations and servers for antenna placement.
Tx antenna placement can be guaged by using the workstation's utility for the Wirless NIC.
A room corner can deflect the signal back into the room thus enhancing the Tx signal. This depends on the wall construction, plain sheetrock will not act as a deflector.
Antenna placement is critical for the Best RF signal!
Consultant / Systems Engineer
member of the IEEE
P.O. Box 1343
Long Beach, New York 11561
tel: (516) 431-5339
mobile: (516) 510-1781