In this paper. we present a low-cost energy-efficient electronically steerable parasitic array radiator (ESPAR) antenna-based wireless sensor network (WSN) node designed for IEEE 802. 15. 4 standard that is capable of performing direction of arrival (DoA) estimation in real-life outdoor environments. https://www.megavitamines.shop/product-category/glucosamine-and-chondroitin/