I agree and waveguide is a dangerous emitter of rays if it gets damaged or even pinholed. There are problems to be overcome such as curvature of the earth and the true height and distance of the target. Air temperature vis -a-vis ground temperature has an effect on range. Overall some form of air patrol and/or a good ESM, ECM, and ECCM systems fitted aboard ship, will always be useful and give one's ship more freedom of action.