Yes I do record myself. It does not take fancy equipment in order to get good quality. I alternate between using an Olympus recorder and my iPad recorder. Both have gotten good results. As for radio signals, it is pretty hard to avoid that. However, it is easy to differentiate between radio signals and spirit voices. Any recording that I am not sure of I automatically debunk as a radio signal, so the skeptics won’t have my head on a platter!
I believe there has been research done with evps, where scientists tried to recreate the voices, and they were not successful at all. Many came to the conclusion that they were actual spirit voices. There is an article on it, so I’ll look to see if I can find it. Also, I forgot to mention that another good piece of evidence is when spirits make ‘comments’ about the person or people in the room/house. For example, I once was in a session and asked the spirit I was communicating with, let’s call her Lily, to tell me me how many people were in the house. She answered back six, I was puzzled as there are only five people in my family, including myself. Once I was done with the session, I went out into the living room and saw that my brother had his boyfriend with him. That was one of my beginner sessions so needless to say I was quite freaked out!