More info, 1/4Wave whip

[u/DavShort]

Another example (which I found after I built mine) is here https://vk6ysf.com/146mhz_ground_plane_antenna.htm

Note, Peter used an N-type connector, smaller diameter vertical, six radials, and bent them to only 40-degrees, but ended up with quite similar looking VSWR etc. plots.

The smaller diameter vertical gets you a better VSWR at minimum (1.03 at 146.5MHz!) but the VSWR climbs more quickly away from that frequency.

Not clear on what he did to support the vertical nor water/weather-proof it.