Yes, communication between 2 seperate entities is difficult at the least.
For another life-form (we presume intelligent, and on par with our technological level) to communicate with us, I would compare with placing a mobile phone in the jungles of New Guinea.
The ringing attracts a native.
Firstly he tries to work out what the ringing sound is.
Then how to stop it.
If by chance he pushes the right button he may hear a voice coming out of the device.
But what is this jibberish he hears?
Similar for us and other beings. And this is assuming that the other beings communicate vocally, or with words. Maybe clicks of the tongue (if they have one).
Maybe they sing like a Whale out of a gland in the middle of their chest.
Can we assume they have a speaking mouth, a language using words, similar syntax, or noise at all.
Then if they actually get to recieve an episode of 'I Love Lucy' it may scare the b-jeez out of them: "agghhh, hideous monsters!".
Or visa-versa.
All this plus messages taking years each way, or in the colour spectrum and not audible radio waves.
Hmmmm . . . communication may not be a simple thing.
But we hope
