I only said that they are above us.
Assuming a flat earth, you can calculate the height of the ballon 'satellite TV' transmitter using the angle above horizontal and direction that your satellite dish must face.
The Astra 2 satellite has an elevation of 25.37deg, azimuth 145.48deg (i.e. direction SE) from London. London is at lattitude 51.5deg. Geostationary satellites are directly above the equator (on the equator satellite dishes point vertically up). Step 1: distance from London to spot on the equator directly below the satellite is 3,932km). Step 2: For 25.37deg elevation, gives a satellite height of 1864km.
Using these figures and assuming the Equator has a circumfereance of 40,000km (same as the globe earth) gives a height of 1,864km. (On a globe earth geostationay satellites are 35,787km above the earth).
Please explain how your ballon satellites can acheive a height of 1,864km and be kept in a fixed location.
If you think that I have made a mistake in my calculations or assumptions, please provide your own.
(My calculations are for a flat earth. They will not be valid for a globe earth).
And a comment on ballon 'satellites': yes, ballons are used for weather measurements, and I believe also for radio comms (moble phone base stations?). But this arguement is the same as: my friend's dog has 4 legs, a head and a tail. Your pet has 4 legs, a head and a tail. Therefor your pet must be a dog.