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Telepathy is also silly, some form of energy which we haven't discovered? Im not saying some races couldn't communicate with magnetic, electric fields or by radio. Still, whole telepathy and faster than light is a stranger...
Interstellar radio is also an issue. It all comes to signal to noise and bandwith. Amount of information you can transfer is limited.
C = B log_2 ( 1+ {S}\{N})
Capacity, Bandwith, Signal and Noice power...
If I have understood above right, the signal power is limiting factor. And it lowers in inverse square of distance. S = P/(4 pi r^2)... Thus at huge distances the capacity to transfer information get's very low.
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