Making a compact dipole for 40M operation.

Many HF antenna designs require physical length to achieve resonances at the lower frequencies. This is not always possible in all situations due to the space available.

However, there is a way to reduce the overall length of an HF dipole through the use of loading coils. Adding inductors to your dipole makes it possible to reduce the overall length of the antenna. The loaded dipole opens up the options for many armature radio users faced with space constraints.

Read more at: https://www.qsoshack.com/40-metre-loaded-dipole/