Have you ever looked at any of the common ghost busting tools critically? Have you ever asked why they are believed to work? It is because someone just decided they do, that's why. The fact is, their effectiveness is based solely on the perception. Of course there are lots of problems with this because proponents quickly paint themselves into a corner.
Well, I would not say all. There are many here who would claim to not be immune to pareidolia. The fact is, if ghosts communicate on the AM/FM bands we would have been hearing them over our radios for years. Doesn't that make sense?
As for energy beings, the same person who will tell you their EMF meter can identify ghosts will probably also tell you that science is not advanced enough to understand ghosts. Do you see the conflicting assertions? Are we really to believe our understandings of quantum mechanics and thermodynamics are inadequate to test the idea of ghosts but some guy with a cheap magnetometer can do it all day long? It cannot be both ways!
Persistent energy clouds do not exist anywhere in the observable Universe and run contrary to the way energy behaves. Thermodynamics stipulates that energy will flow from regions of high concentration to regions of lower concentration by the shortest available path until equilibrium is reached. In other words, energy rapidly diffuses into its surroundings. If there were indeed free roaming energy "beings" they would likely be everywhere and would certainly have been noticed by someone with credentials by now. Finding such a field would be Nobel Prize stuff.
“Condemnation without investigation is the height of ignorance.” Albert Einstein
By its very nature, science will always be a work in progress. The fact that some hypotheses required more work that others to become accepted theory does not make other hypotheses any more valid. That is a good Einstein quote but it does not apply in this case. Einstein was not advocating belief without evidence. A little research will reveal his feelings about belief.