That was made difficult by the ability of some radars to quickly change frequencies. We had to learn when to transmit and when to listen and watch for what our opponents were doing. We also learned how to employ radar decoys, echo producing bits of metallized plastic strips tossed into the air to fool the enemy. There are definite techniques to learn, concerning when and how to use that material known as chaff. And there are several types of chaff available.
Some chaff is cut to length according to the radio frequency of the radars to be cluttered.
Other chaff comes in long strips, like a piece of audio recording tape with one end attached to a simple carboard square which acts like a parachute. As the reflective strip slowly falls to earth, dangling below the cardboard square, it twists and turns to present a varying reflective surface. That effects radars of different frequencies and wavelengths. The course also introduced us to newer ECM equipment, not yet installed in our aging C-54's. We were taught what to expect in our future assignments aboard a variety of strategic and tactical aircraft, to which class members would soon be sent.