How do television networks and radio stations know how many people are listening to their shows?
there are two ways in which it is done, the first way is by sampling people and filling in the questionairres you often find in cd inserts etc which offer a prize or other services you want eg info on certain pop group so you fill in the questionaire the second way and more advanced way is people are chosen at random to have an electronic box fitted to their tv/ radio and this measures what prog you watch / listen to how long for what days and how often, and from tese random tests they can apply their results to mass population I think your dads way is good theory but is flawed as many factors can affect signal strength, and doesnt diminish depending on how many people are recieving it
