On Thu, 28 Aug 2003 12:42:15 -0400, "Ralph Mowery"
wrote:


While it may not work for you , look up "passive repeater" This is an
antenna aimed at the desired station (on the outside of the building in your
case) and a feedline inside the building hooked to another antenna.

In most cases you have to be quite close to the indoor antenna (within
a few meters), since the signal reradiated from the indoor antenna is
suffering an additional inverse square attenuation.

The worst situation for a passive repeater system is when the repeater
is in the mid path with the end stations A and B. The path losses
(expressed in decibels) from A to the repeater and from the repeater
to B are _added_. Compare this to the free space (line of sight
situation) in which the total path loss from A and B is only 6 dB more
than compared to the path loss for A to the mid point repeater
location.

In a passive repeater system, moving the repeater closer to the other
station, the sum of the path losses from A to the repeater and from
the repeater to B (expressed in decibels) will be smaller than with a
repeater in the mid path.

I have not seen it but have heard that in long tunnels they have an outside
antenna and an amplifier and some inside antennas for the FM radio stations.

Leaky coaxial lines are used as "antennas" in tunnels.

Paul OH3LWR