I show you how to calculate the right sized loading coil - and how to make your wire dipole or vertical antenna shorter by placing the correct loading coil in the right place on the wire. Links as follows:
https://www.66pacific.com/calculators/coil-shortened-vertical-antenna-calculator.aspx - Coil Placement
https://www.66pacific.com/calculators/coil-inductance-calculator.aspx - Coil Calculator