There are a few I can think of for radio, though they're geared to amateur (ham) radio as opposed to RC control or more modern topics like bluetooth or wifi. The folks who make use of what follows mainly spend time tinkering with low power homebrewed ham radio transcievers. It's a long shot that this will be your exact interest, but it's what I know the most about in terms of RF.
The ARRL Handbook - Somewhat of a bible for radio builders and operators. Some of the material is particular to US regulations, but the RF engineering stuff is universal and exhaustive. I think it's only printed in English, but I'm not sure.
I found a link for the newest edition on the site you mentioned. A new one is released each year, and some prefer the editions from the mid '80s as there's more focus on discrete component analog designs as opposed to using ASICs and digital modes. Searching for ARRL (American Radio Relay League) will show you all sorts of other publications that are released from the same folks on more focused topics.
Crystal Sets to Sideband - A free book in multiple PDF form that's designed to be an introduction to ham radio with a focus on building your own gear. This book approaches RF engineering from the ham radio perspective and is very anecdotal and low math. Lot's of history and personal experience make for a pleasant read.
Experimental Methods in RF Design - Another great ham radio book,
also available on the site you mentioned. Considered very important by those who build low power transmitters. I don't have a copy yet, but I've heard it mentioned so many times that it's sure to prove useful if you spend any time in the field.
Solid State Design for the Radio Amateur - Yet another ham book, though I believe out of print. It's often mentioned in the same breath as Experimental Methods. It's not available at the site you listed, and can be difficult to find anywhere, but if you really get into QRP ham radio it's worth tracking down.
Hope that helps some. I don't have enough experience to advise on anything else, so anything else I could advise to would be guesswork.
