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Look at American Radio Relay League and Radio Society of Great Britain websites for publications. There are also many others aimed at radio amateurs. I am not sure what you mean by 'solid.' It's safe to say that the books aimed at radio amateurs will be somewhat different than a book written for an RF engineer. Many of the amateur books that I have do tie in well with other publications even though they can stand alone. I understand that many design professionals do use these books.
It doesn't get anymore "hardcore" than that book. If it isn't covered in the 1500 pages there, you have discovered something new.
May be a little hard to find though, been out of print for a few years now ( was in print for over 50 years tho :shock: ). Quite the gem.. covers ALOT more than RF, very useful reference. Sort of the equivalent of the Machinists Handbook for electronics.
It's the kind of book that the more you read the more you realize how much you don't know!.