Much of HamSCI research looks at communications in the High Frequency (HF, 3-30 MHz) radio bands. The HF bands allow for both global communications and techniques for remote sensing the ionosphere and space. The HF bands have seen a resurgence in recent years, as new modulation techniques are developed and people realize the importance of diversifying their communications infrastructure. Paul Denisowski, KO4LZ, engineer for Rohde & Schwartz North America recently wrote a white paper entitled, "The Rebirth of HF". This paper is made available here with permission from Dr. Ulrich Rohde, N1UL. Also available is a presentation by Dr. Rohde on Emerging Trend in 5G, IoT and SDR.