Don't underestimate the effect of any extension cables or adapters used in relocating the antenna or adding an optional/aftermarket antenna. Incorrect or poor cable, terminations and adapters can easily negate the increased gain of the antenna.

Ray,Dependent on the tunnel length, size, and construction methods you may want to look at a product such as "Radiating Cable" or leaky cable as we use to call it. Basically it is a high quality transmission line that has a series of milled holes or...

Victor,If you could provide some parameters including data on the Building (sq footage to be covered, # of floors), Users, (# of users, are they clustered, or evenly distributed or roaming), Goals of the client (basic IP connectivity for email?, w...