Explanation: An ohmmeter measures DC resistance, not the RF impedance that an antenna presents at its operating frequency. Many antenna designs, especially certain vertical antennas with base loading coils or shunt-fed systems (like some gamma-matched or grounded verticals), are intentionally designed to have a DC short or very low DC resistance between the center conductor and the shield at the feedpoint. This "DC grounding" can serve a beneficial purpose, providing a path for static electricity to discharge, which helps protect transceivers from lightning strikes or static buildup. Therefore, measuring a short circuit with an ohmmeter can be a normal indication for a properly functioning shunt-fed or DC-grounded antenna system, rather than a fault.