Factory installed com antenna in the fin.

Hey Group,
I've got a 1975 Std, Cirrus new to me. I am replacing the com radio and in the process I deleted a poorly done splice in the coax cable with a rg-58 solder end.
After the bnc end was installed, I measured the resistance between the center and shield leads, I measured 0.9 ohms, thinking I had a stray shield wire or other problem, I removed the new bnc end and measured the bare end of the coax, still 0.9 ohms. Then I reinstalled the bnc end, same 0.9 ohms.
Does the special type of antenna in the tail has some weird ohm value?
Using a handheld I wouldn't miss if it fried, I measured swr and output watts, (using a MJF model 812B swr/watt meter)
watt output is 3-4, swr is 1.6-1.8 (in my garage, not ideal), Output watts are probably what the icom a-2 is putting out.

So, I'm not confident that the coax and antenna is safe for my radio, every other coax and antenna combination I ever measured was infinity between the ground shielding and the center lead.

I'm using a decent blue point digital multimeter.

Any Thoughts?

Thanks
Scott W