We have a larger home, around 7,500sf. We struggled with multiple companies over the years to get a solution for the lack of wireless due to the concrete and steel construction.
We tried AV Trends, they gave us a guarantee, that they would install a wireless solution that would work. Much to our surprise, this wireless mesh network they installed not only gave us full wireless throughout the home, but it extended out across the entire property!
Finally happy to see a company that specializes in everything! They will be installing the same technology and a new audio/video system for us at our primary home in Massachusetts as well this summer. They travel!

ps - ask for Joe