Update README.md

sh123 · Dec 27, 2024 · 12c194b · 12c194b
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diff --git a/extras/cad/README.md b/extras/cad/README.md
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 - `antenna_base` - base for rubber duck antenna, to be printed with PETG filament.
 - `antenna_cover` - cover for rubber duck antenna, to printed with TPU filament.
 
-&#128073; Rubber duck antenna spiral widing was done with 1.3mm copper wire on 8mm aluminium scaffolding tube.
+&#128073; Rubber duck antenna spiral widing was done with 1.3mm copper wire on 8mm aluminium scaffolding tube, ~8 turns with 6mm step
 
 **Tracker case**:
 - `aprs_tracker_e22_base` - base for tracker case without battery compartment.