Remember the internet from the ITCrowd? You could build sort of your own version with the RPi-A:
You can build your own in"tra"net versus using the in"ter"net. But if you really want to be useful you might want to use a stationary satellite.
But then to get world wide coverage you might need several stationary satellites.
Do not tell me someone has not already done this. So you get:
Getting close to home. Even if you do not have all that fancy equipment you can still build a private intranet.
A bit dated, but still viable:
In part one you will get the basic setup and a few tweaks.
In part two you will get some additional tweaks.