Abstract: With the rapid development and commercialization of fifth-generation (5G) technology, calibration and RF testing using over-the-air (OTA) is becoming increasingly important. Due to the large ...

November 24, 2025 • Our annual reading guide returns with 380+ new titles handpicked by NPR staff and trusted critics. Find 13 years of recommendations all in one place — that's more than 4,000 great ...