They actually already do "postal zone dumps" in the United States, in that the front of every single piece of mail sent through the Post Office is imaged and put in a database for law enforcement. They've been doing it for some time.
I had no idea this was being done.
You'll need a dish (typically 90cm), somewhere with a view of your selected satellites to plant it, an LNB to go on the dish (Low Noise Block Amplifier, the actual "antenna"; the dish is just a reflector), a bunch of RG6 cable leading to your TV, and a receiver.
Before buying all this, take a look at the various satellites and channels available to you, and pick a starting satellite. You'll need to be sure that you have a clear line of sight to the "bird". A great site for this is lyngsat. In the US I suggest starting with Galaxy 19, which has several hundred channels on it.
Summarizing the rest, plant the dish, aim, and scan with your receiver to program the channels. You can get all sorts of things regularly, and occasional "wild feeds" that aren't intended for public consumption. There's also encrypted video, which is either pay TV, private company channels (like Ford, etc.) or network backhauls.
Later on you can get into multiple satellites, either with multiple LNB's on one dish, multiple dishes and a switch, or a motorized (!) dish. They're all fun.
It's a lot of fun, and can be a great intro for kids to electronics, radio reception, satellites, orbital mechanics, space, etc.
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Except that in only a few countries are you able to go that far. Most places require you to stop short of the lethal dose and live in excruciating agony for as long a your systems (and technology) will support you. Have a nice day.