In plain language: The Inverted L divides the 73 ft wire into a vertical rise and a horizontal top section, using one high support and the 25 ft counterpoise at the feed point.
Use the Inverted L when the site can provide height near the feed end but cannot stretch the complete radiator in one straight slope.
Build the documented shape
- Raise the wire over one support so the first portion is vertical and the remaining portion runs horizontally.
- Keep the matching unit low and connect the specified counterpoise.
- Support the far end with nonconductive line at the guide height.
- Preserve clearance from branches, structures, vehicles, and people.
Why an operator chooses it
The mix of vertical and horizontal current produces different low- and higher-angle opportunities than a pure vertical or low horizontal wire. It also fits sites where a 73 ft straight run is impractical.
Read the site before opening the bag
Measure the vertical rise and the horizontal span; “looks like an L” is not a repeatable geometry.
Common ways this goes wrong
- Allowing the vertical wire to touch the support.
- Treating the horizontal end as optional excess wire.
- Running the counterpoise alongside the radiator.
- Assuming a low SWR proves the shape is working as intended.
Before you transmit
- Confirm the exact radiator, matching unit, return path, feed line, and support arrangement.
- Keep conductors and supports clear of power lines and uncontrolled public access.
- Reproduce the guide dimensions before experimenting.
- Inspect every connection and begin testing at low power.
- Record geometry, band, tuner state, and the result before changing one variable.
Boundary: The guide’s geometry is the controlled starting point; support material and nearby conductors remain site variables.
Use the current source before deployment.
This lesson explains the decision. The official guide controls assembly, ratings, configuration details, and safety.
Open the MPAS 2.0 User Guide · Open the MPAS READY Product Guide · View the current product page
