Method of Intrusion
For analog stations it is relatively easy to break into the transmission network. All that is needed is to determine the frequency used in the studio-to-transmitter link, then generate a higher-powered signal at the same frequency from a position near the broadcast transmitter site, essentially jamming the original signal. The input stage of a cheap video sender can produce the right kind of signal. A low-power microwave signal generator or a homemade equivalent from easily available components provides the signal (which is pointed at the receiving dish antenna). Most larger stations encrypt their signal, in which case one would just jam the signal, as is the case with digital. Most TV and radio stations are extremely vulnerable, but lack of knowledge has kept this from being a problem.
Read more about this topic: Broadcast Signal Intrusion
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