Metasurfaces and antennas have emerged as powerful platforms for advancing wireless communications, sensing, and holographic display technologies across the electromagnetic spectrum. This talk will highlight recent developments and challenges in these areas, with a particular focus on open stopband issues in optical antenna designs. We will discuss the design and implementation of long-wave infrared (LWIR) metasurfaces and millimeter-wave (mmWave) metasurfaces featuring optical transparency and seamless thin-film integration. Special emphasis will be placed on enabling dynamic amplitude and phase tuning for next-generation reconfigurable systems in wireless, sensing, and holographic applications.