Because Aereo was selling a service of setting up and running that equipment for you.
I have mixed feelings on the whole case but your example isn't directly comparable.
Really though the whole idea of local broadcasts of national shows no longer makes sense. The networks should just live stream their shows online for everyone. This isn't in the interests of the local affiliates and probably is not legally feasible right now due to various contracts with them.
But because of technological changes we don't need local affiliates in their current form anymore. Of course there are local news shows and they are still valuable and networks should show locally targeted commercials but the old broadcast using local affiliates model doesn't make sense with modern broadband capabilities.
I have mixed feelings on the whole case but your example isn't directly comparable.
Really though the whole idea of local broadcasts of national shows no longer makes sense. The networks should just live stream their shows online for everyone. This isn't in the interests of the local affiliates and probably is not legally feasible right now due to various contracts with them.
But because of technological changes we don't need local affiliates in their current form anymore. Of course there are local news shows and they are still valuable and networks should show locally targeted commercials but the old broadcast using local affiliates model doesn't make sense with modern broadband capabilities.