To properly understand the antenna, I've been frantically asking about concepts like "deepseek impedance resonance point," but I feel like without a systematic understanding, I only know the conclusion, not the reasoning. So, could someone recommend some beginner-friendly books on antenna principles? I recently found a video titled "Antenna Principles by Chu Qingxin from South China University of Technology" and am currently studying it. Is it feasible to learn from such specialized videos? Please provide guidance.