what if ur in a city and the to of the buildings are already several hundred meters high? then if a thing is tethered to the ground it might bump into buildings.
Start at the building tops - cell sites already do. The issue is to get very close to LOS to the user base so that that data vs. energy is maximized. Take a look at COST231/Hata or similar real-world RF pathloss models. Anything other than LOS is a killer and can't be afforded. The present flooding model for cellular architecture is inherently broken. Montana|Idaho|etc never will get full coverage highspeed data, the present approach doesn't scale. Going too far/high doesn't work either. Satellite distribution (from Iridium to geosynchronous and beyond) doesn't work either. Has to server too many users/needs to much devoted energy/user. Has to be lots of points of presence, LOS and close to end users.
Did you know that for the price of a 280-Z you can buy two Z-80's? -- P.J. Plauger