I have a discone antenna intended for use in the 25-1300 MHz frequency range, but it uses a SO-239 connector.
Now, we know that the so-called "UHF" i.e. the PL-259 male plug and SO-239 female socket connectors are not great even in the 30–300 MHz (VHF) range, much less at the 300–3000 MHz frequencies range we now officially call the UHF range. So it seems like an unfortunate choice of connector for an antenna that works up to 1.3 GHz. And indeed other wideband VHF/UHF antennas (e.g. the CLP-5130 log periodic which also goes to 1.3 GHz) do use a "proper" N connector instead.
But since is the "end of the line" anyway, where the coax ends and the antenna begins, is there really any practical difference to the choice of connector here? If it's okay to solder antenna elements directly to coax would a short bit of whatever intervening metal be much worse, especially if it's yes primitively but yet still (maybe?) somewhat designed for higher frequency RF?
Likewise, what difference does the UHF connector on the radio make? Many base stations that I've seen have a sad little piece of coax, half of which has been peeled apart so it can be soldered to the PCB and to the connector itself. This is usually justified against the "1/10 wavelength" rule of thumb, where the impedance of short traces/leads isn't considered particularly important.
So by the same rule of thumb, do the poor specs of a UHF connector really matter in the UHF range? A tenth of a wavelength at 3 GHz is 1 cm, which is about the depth of a typical PL-259/SO-239 threaded connection. Or to put a picture (found via http://wa6pzb.blogspot.com/2014/09/220-mhz-ground-plane-antenna.html but looks to be credited to AI4JI originally) on this question:
If I were to make this ground-plane antenna with elements targeting a 1.3 GHz resonance, would it make any difference if built it around a "proper" N or BNC socket vs. any old UHF socket? And if so, why? It seems to me like the transition from "coax" to "antenna" is going to be pretty rough regardless!