While air unmanned ballons are operating higher any airship I'm aware of had much _lower_ altitude limits then many aircrafts as far as I remember. But I don't know weather it where piratical or technical limitations.
And it it's sensitive to wind you probably don't want to get it anywhere near to either of the jetstreams (which in some areas are rather turbulent as far as I remember).
The google patent probably is from when they operatted unmanned balloon and drone mounted radio stations for special purpose usage. I think they stopped it even through it worked okayish because it wasn't profitable enough but I don't remember for sure.
And it it's sensitive to wind you probably don't want to get it anywhere near to either of the jetstreams (which in some areas are rather turbulent as far as I remember).
The google patent probably is from when they operatted unmanned balloon and drone mounted radio stations for special purpose usage. I think they stopped it even through it worked okayish because it wasn't profitable enough but I don't remember for sure.