[Tagging] towers, why limit communication towers to 2way and broadcasting?

[John Sturdy]

On Thu, Nov 3, 2011 at 1:35 PM, Martin Koppenhoefer
<dieterdreist at gmail.com> wrote:
> or maybe even better:
> "Communication towers are intended to hold equipment for broadcast,
> two-way communications or reception; such as radio, television,
> cellphones, two-way radio and optical communication."

At first I thought of this as a joke, but then realized perhaps we
should include it for real: does optical communication include
traditional fire/smoke beacons and semaphore towers?

__John