[darkmighty]

I found some of your claims a little hard to believe. 1km+ range behind walls?

Do you have any test data to confirm this? Is there a device that can be acquired that has implemented your specification?

[jpnorair]

It is a feature of using lower frequencies together with lower data rates and signal processing technologies. Consult with any RF engineer -- there is no magic here, just practical engineering to solve a particular set of problems.