I've done a lot of research into antennas.

I have serious doubts that this one pictured, will be any good.

Of course, the only way to know for sure, is to hook it up to a Vector Network Analyzer.

It went down slow, I made a rookie mistake. It definitely didn't overheat as I've been watching the temperature of it. I just ordered this: https://www.amazon.com/dp/B07T6LXNTV/ref=cm_sw_r_other_apa_glt_i_RMEXJDMY2SNZHXQ3AY5F so I'll see how fucked I am.

It was from Amazon, called AURSINC Vector Network Analyzer....

Make sure you have the proper adapters. It just has the female SMA connector. I happened to already have one for my HT.

This one.

Amazon $54 usd

https://www.amazon.com/AURSINC-Analyzer-Measuring-Parameters-Standing/dp/B07T6LXNTV/ref=sr_1_36?crid=Y8W6B5AQS2AD&keywords=vna+analyzer&qid=1655471275&sprefix=%2Caps%2C165&sr=8-36

Just to have a better visual, your is your mount the Firestik DM4/DM4A?

0.5 ohms from coax to battery terminal is likely fine, depends on your meter but most handheld meters aren't going to read much lower than that anyway. If it's ohming out to the battery terminal it's probably good, but I'd check from the coax shield to the sheet metal around where the mount is installed as well just to be sure.

Before you go to trimming the whip, if you have some alligator clip leads you could stick some at the top of the antenna and see if making it longer helps. Though you can't really extend a whip so not that helpful, but could at least see if you get a different reading. If it gets worse you know that trimming it will likely help.

Also, while that RigExpert AA-600 the one guy recommended is expense as hell, you can get a NanoVNA for like $50 and it'll be good enough 99% of the time. Makes tuning antennas a hell of a lot easier. Here's an old post I made about it a while back.

I've bought from this listing in the past and had good luck, admittedly YMMV since there are a lot of bad quality versions of the NanoVNA out there. Would just need an SMA male to UHF SO-239 female adapter (or whatever your coax is).

I will probably just end up buying a new antenna, i ordered this analyzer: https://www.amazon.com/dp/B07T6LXNTV/ref=cm_sw_r_other_apa_glt_i_RMEXJDMY2SNZHXQ3AY5F

Live and learn! Smh

Just ordered this: https://www.amazon.com/dp/B07T6LXNTV/ref=cm_sw_r_cp_apa_fabc_BMW3HJ9D7NVEBF1STDTB

If he doesn't already have one you won't go wrong getting him one of these:

NanoVNA Vector Network Analyzer