Why the complete system matters
Coil position changes current through the coil and the remaining conductor. Inductance, self-capacitance, conductor resistance, core or form loss, voltage, and weather determine bandwidth and efficiency.
The assumption that breaks it
A coil that produces 1:1 SWR can still dissipate substantial power, and moving the same coil between radiator lengths does not preserve the electrical design.
Build or deploy it correctly
Use the documented radiator/coil combination, keep connections clean, tune in final geometry, monitor temperature and voltage limits, and compare field strength or modeled loss—not SWR alone.
Use the exact product guide, electrical topology, geometry, materials, loading, feed, return path, support, and environment. Mechanical fit or a visually similar arrangement does not establish electrical equivalence.
