"Why wouldn't the TV, GPS, and internet companies that use these services front the bill? "
Please explain this.
"Also, I didn't say blimps were the sole reason,they are just used in areas (like desserts) that aren't covered by other means."
Because noone ever visits deserts, isnt that right? There can't be huge towers in Africa (mostly the southern part), but that land is HUGELY populated - someone must have seen some of all those blimps. It isn't exactly common to see a blimp, you know.
And it's not just Africa, it's every developing country that can't really afford high-tech towers everywhere, that have to have flying blimps everywhere.
The reason for these pseudolites is due to the need of services that use "satellites". The companies that provide these services (Dish network,Hughes net, ect ect) would pay for use of these psuedolites.
A high flying blimp is very difficult to spot. Also, ships could be used as well.
Hate to point it out to you, but for a blimp to be able to fly that high and not be detecable, it would run into your sun and moon, and how would ships be any affect, I don't use my cell phone out in the pacific ocean, and what about airplane travelers, surely they could spot your blimps