If you haven't done so check out "From Crystal Sets to Sideband". It's a classic by Frank W. Harris, KØIYE.
It's not just dry textbook. Instead it's a fascinating journey of technical discovery. And very practical.
The a free pdf available on the QRP ARCI website.
If you've read it, please leave your comments on it below.
PS: Want more reading, but this time about antennas? Consider this selection of antenna books. They are affiliate links meaning that I receive a small commission (at no extra cost to you) if you decide to purchase.