[MLB-WIRELESS] Colorbond/roof insulation interference.

[John Dalton]

> The roof consists of corrugated colorbond with some type of metal "foil"
> insulation between it and where the antenna would be located.

2.4GHz radio waves (as used in WLANs) will not propagate though metal.
A colorbond roof will block any signal from an antenna in the roof space.
(Possibly you will get a weak signal though the ceiling, but any decent
singal will be a fluke.)

> Also, does anyone know if there are any problems with having two antenna
> mounted on the one mast?

You may get intermodulation distortion when one antenna is in transmit mode
and the other is in receive mode.  The nearby transmitter saturates the receiver,
leading to a high bit error rate.  Things get better if you can arrange for
each antenna to be in a 'null' of the other's radiation pattern.  Typically
an omni will have a null on it's axis, so an antenna directly below it will
be in a favourable position.

John

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