An apparatus for inspecting a component of an aerial power line. A frame has a support member extending along a support member axis. The support member is mountable about the power line in proximity to the component. The support member is rotatable about the line axis upon being mounted about the power line. A stabilizing member is mountable to a stabilizing structure separate from the power line. The stabilizing member is mountable to the support member to rotate the support member about the line axis. A source of electromagnetic imaging energy is mounted to the support member and has an emitter to face the component. A detector is mounted to the support member at a distance from the source to position the component between the source and the detector. The source and/or the detector is displaceable along the support member axis to vary the distance separating the detector and source.