Part of our Building Your First Ham Radio Station guide.
Coax dominates modern ham radio for good reason, but ladder line and open-wire feedline have not disappeared, and for a specific kind of multi-band wire antenna, they still solve a problem coax genuinely struggles with.
Why Ladder Line Loses So Little
Ladder line’s two parallel conductors, held apart by insulating rungs with mostly air between them, lose dramatically less signal to a bad SWR than coax does. Coax loss increases sharply as SWR climbs, which matters a lot on a multi-band antenna operated well off its design frequency. Ladder line’s loss stays low even at SWR values that would waste a meaningful chunk of your power in coax, which is exactly why classic multi-band doublets and G5RV-style antennas were designed around it.
What This Enables
A doublet fed with ladder line running to a tuner at the radio can be loaded up and operated across many HF bands from a single antenna, even at wildly varying SWR values on different bands, without the significant loss coax would introduce under the same mismatched conditions. This is the whole appeal: fewer antennas, one feedline, broad multi-band coverage.
What It Costs You
- Ladder line must be kept away from metal objects, gutters, and anything conductive, since proximity disrupts its balanced characteristics and introduces loss and pattern distortion.
- It cannot simply route through a wall the way coax can, requiring careful entry points that maintain separation from the house structure.
- You need a tuner capable of handling balanced or high-impedance loads, not just a standard 50 ohm coax tuner, which usually means a balanced tuner or an unun at the shack end.
- It looks and behaves differently from tidy coax runs, which some hams find genuinely annoying to route and support cleanly.
Is It Worth Considering Today
If you want one antenna to genuinely cover many HF bands with minimal feedline loss regardless of how far off resonance you are operating, ladder line paired with a doublet and a good balanced tuner remains a legitimately excellent, if slightly old-school, solution. For a single-band or narrowband antenna, coax’s convenience wins easily, and there is no real reason to bother with ladder line at all. For more on how a doublet’s feedpoint compares to other wire antenna choices, see Center-Fed vs End-Fed: Choosing Your Antenna’s Feed Point.