The first example is a USA wide two way radio monitoring website. It allows people to listen to a wide range of commercial, law enforcement, railroad, and industrial radio channels. To use it, you enter in the location that you want to listen to (For example Chicago ) on the map, select what type of service you want to hear ( airport, state Police , Fire department, or city works vehicles.)
The second example is a similar "listening website " that covers all 50 US States. Select the state then the area, then the service type , that you are interested in receiving on your home computer or I Phone.
The third website is an international world wide computer website that allows people to tune into amateur radio broadcasts in over 170 foreign countries, 24/7.
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