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In article ,
Jim Lux wrote:

Karl NVW wrote:
eganders wrote:

I am a consultant for an AVL (automatic vehicle location system)
system used by the Southeastern counties of Michigan. 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?

Thanks,

Eric Anderson

What the heck....I'll give an opinion, since no one else has.
You might try a passive repeater antenna system. It would consist of an
outside antenna (preferrably directional with gain) pointed at the distant
station, connected by a transmission line to an antenna as near as possible
to the maintenance vehicles.

I say "try" because only a small part of the radiated power is intercepted
by the passive repeater receive antenna. Then that small part is
re-radiated in a pattern such a much smaller signal arrives at the ultimate
antenna.

If you have homebrewing 900 mHz antenna skills, test hardware can be
constructed rather inexpensively.