Wire Dipole Antenna Center Insulator
Centre insulator for a wire dipole or inverted-V: a 140 x 76 mm ribbed plate with a wrap-post cleat on each leg (3.8 mm entry/exit holes for #14 AWG THHN at ~3.4 mm OD, around a 7 mm post) so the antenna tension is carried by the plastic instead of the solder joint. The 42 mm coax tail has three zip-tie stations (3.0 x 5.5 mm slot pairs on 18 mm centres) that strain-relieve RG-58, RG-8X or RG-213, and the top tab carries an 8.4 mm rope eye plus two M4 clearance holes (4.5 mm) for bolting to a mast plate.
electronics ham-radio antenna dipole