HE Series Embeddable 1/4-Wave Monopole Antennas TE Connectivity / Linx Technologies HE Series Embeddable 1/4-Wave Monopole Antennas are available at frequencies of 315MHz, 418MHz, 433MHz, 868MHz, and 916MHz. These helical coil antennas feature a rugged phosphor-bronze construction in surface-mount and through-hole styles. The compact, precision-wound coils fit in small spaces and are ideal for cost-sensitive applications. TE Connectivity / Linx Technologies HE Series Embeddable 1/4-Wave Monopole Antennas offer 50Ω impedance and an operating temperature range of -40°C to +80°C or +85°C. Typical applications include ISM, LoRaWAN®, LoRa, Sigfox®, Internet of Things (IoT) devices, sensor networks, alarms, security systems, as well as remote sensing, monitoring, and control.