The fermi paradox can be explained many ways but few of them are really a solution. IMHO time that a civilization is detectable is short, our own planet is slowly becoming very quiet due to our communications becoming digital and less energy is wasted on newer networks. Distance is another problem, it is said that Arecibo could detect another telescope like it's self all the way across the universe or some vast distance but that is misleading. Due to em inference, interstellar dust, and other problems it's doubtful Earth's radio leakage could be detected at the nearest star, military radars might be an exception but the wow signal, one short but powerful series of pulses imitate what receiving a military radar might look like but that is just speculation. The truth is unless someone is sending a powerful beam pretty much directly at us it wouldn't be seen by us nor would we be seen by them.