You can find Robert Zavrel’s book, Antenna Physics: An Introduction 2nd Edition, Your Complete Guide to Antenna Theory, on ARRL.
How to Improve Antenna Performance
Precision Antenna Measurements eBook with Microwave Journal
Antenna Component Testing Webinar
Remote Measurements of Horn Antennas Video
In-Circuit Antenna Verification Video
Automated Antenna Testing App Note
Testing & Matching PCB Antennas App Note
WiFi, Bluetooth, and PCB Tuning and Antenna Testing App Note