In article . com,
eganders wrote:

The system is
used on winter maintenance vehicles and works on 900 MHz. The
vehicles are often stored overnight in metal buildings where it is
difficult to obtain transceiver communication from the AVL system. Is
there a low cost (possibly passive) way to port 900 MHz radio
transmissions into these buildings?

Eric-

As others have mentioned, a two-antenna system may work. If that is not
sufficient, there are bidirectional amplifiers that might make it work.

If the AVL system uses packet radio technology, another packet radio
transceiver close to the building can be used as a digital repeater.
Depending on just how shielded the metal buildings are, being close may
be sufficient. The AVL system would need to be programmed to include
the repeater's ID for repeated transmissions.

You might also consider a phone line connection to a low power
transceiver inside each of the buildings. This may be the most
dependable method.

Fred
K4DII