3 bright triangular lights,(red) with another a short distance from the triangular base on the right side as observed ( the triangle was apex down ) About 2 miles away, over the sea. Stayed motionless in the evening sky ( clear evening, minimal cloud ) alttitude about 2000 feet. The size of the triangle was quite large, much lager than any existing airliner ( which it was not !! )nor a helicopter. These lights remained stationry for at least 6 minutes, and then one by one went out. This object has been seen at least 3 times over our town in a month. Local residents have seen it gliding silently, and low ( anout 500 feet ) over houses before going out to sea. We are baffled. I am an aircraft enthusiast, used to observing them. This object was like NOTHING I have ever observed. No obvious military or MOD activity in the area. My wife observed this as well..we are both baffled