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For sure!
They specially are build for communication. TV, telecommunication, internet..
Hint: simply do an internet search about "geostationary satellites" on your own.
Imagine: if the TV satellites were not geostationary, you'd need an antenna with two motors to follow a "moving" satellite... and after some time it will loose the satellite behind the horizon, then TV is OFF ...
You can do a two-way radio communication with a moving satellite, without a rotary (motor) system antenna: https://www.youtube.com/watch?v=bT131WBHKxc
But these are Low Orbit satellites (altitudes below 2000 km).
To reach a geostationary satellite at 35.786 km is more complicated, and to find the needed power (and EIRP) have to read the Earth Station specifications (uplink) for geostationary satellites.
From what I know the power levels of these earth stations (to get a steady link connection) is in the range of tens of watts.
Just a note. I assume that you are interested in two way communication. A transmitter on the ground can connect to Boulder Dam and get plenty of power. Big ground station antennas are also usually also practical. The link from the satellite is almost always power and antenna gain limited. The outward bound signals are thus not symmetric with the returned signals. Communications with satellites well above geo orbits are also practical and with similar constraints.
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