Tue Apr 17, 2007 7:50 pm
A triangular-looking thing at the bottom, you say? Are you referring to an E-57 siren? An E-57 siren can rest on a small pole which can be attached to a roof. I have seen a local ESA 20-01 standing on a small pole, with the pole resting against a [possibly an elevator-room] small utilities-room on the building.
~ Peter Radanovic