Ladder Line Standoff Insulators
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For antennas that use 450 Ohm ladder line, such as doublets, these standoffs keep the line away from the roof.
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- Printables
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- Electronics
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- Creative Commons — Attribution
Many amateur radio operators use doublet antennas that are optimally fed by ladder line. Ladder line, unlike coax, must be kept clear of conducting objects. These standoffs allow the ladder line to be routed in such a way that it is kept off the roof and away from gutters, drip rails, etc. These are sized for standard DX Engineering 450 Ohm ladder line.
Two versions are provided: the vertical one is glued into its base with cyanoacrylate. The other one mounts parallel to the surface (think horizontal but screwed onto the roof top) and is simply mounted with one screw. See the pictures. The small top cap screws into the larger part using M3 X 16 flat head wood screws (or #4 in the USA). The larger base is sized for M6 sheet metal screws (or #12 in the USA).
I have had good luck with PETG outside. The white units in the pictures have been in the sun for about a year in Tucson, so they should hold up anywhere. If you get ice, you might want to beef them up a bit. I used a 0.6mm nozzle and standard settings. One file is provided - just copy and paste or delete the parts you don't need. They will print on a Prusa Mk3 if you orient the long part from corner to corner.
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