Latency of course. It is often called "ping" on multiplayer online games.
Depends on your location, If you are seeking signal strength, It is advised that you research the mast location and its radius.
Overhead
PSTN will convert the digital signal from VoIP into voice signal. Their networks interacts using satellite frequency.
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Jam signal
A Wireless signal (WIFI) A signal from a network is routed through a Router wireless or wired. The signal broadcasts throughout an area where another computer receives it thus enabiling access to the internet.
Telecasts, when any television signal is sent to another device or location.
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Network Management signal
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Crosstalk is an undesired coupling from one circuit or medium to another. In amateur tradio, crosstalk is defined as any phenomenon by which a signal transmitted on one frequency creates an undesired effect on another frequency. Check Wikipedia for a neat answer http://en.wikipedia.org/wiki/Crosstalk