Ukommi, Ubong, and Emmanuel Ubom. “Impact Assessment of Elevation Angles on Signal Propagation at VHF and UHF Frequencies for Improved Rural Telephony”. ABUAD Journal of Engineering Research and Development (AJERD) 6, no. 2 (November 20, 2023): 136–142. Accessed February 5, 2026. https://journals.abuad.edu.ng/ajerd/article/view/294.