Aerial markers are disclosed for hanging on overhead support cables at discrete spaced apart distances to warn passersby, such as airplanes, helicopters, hang gliders, hot air balloons, and the like of the presence of the cables. The aerial markers can be made in multiple parts, having various parting lines, including a vertical parting line, and can be hung in a spaced relationship to the support cables. To space the marker body from the support wire, a support frame is used to enable hanging the marker body via one or more external clamps. Direct connection is also possible.