Well, there's really not much to say about this book. It is an encyclopedia of radio horn speakers, the fancy and quaint devices that allowed more than one person to hear a radio broadcast in the twenties. As a resource, I can't believe you'd find much more anywhere on the subject. It isn't the most enthralling read, but there are a lot of interesting little facts here and there. I enjoyed most of it simply because if was a rare look at how folks listened to old time radio back in the proverbial "old times".