Looks like coax to me too....

Another problem is that the MFJ-259 isn't a very good VHF impedance
meter. The resistance and reactance readings aren't going to be at all
reliable on 2m, unless the impedance is close to 50 ohms, resistive.

I recently recalibrated mine since it was giving weird results on
purely reactive loads. The calibration procedure checks resistive
loads of 12.5, 50, 75, 100, and 200 ohms. I used SMT resistors on BNC
connectors as decent loads.

After I did the calibration, the 200 ohm load at 144MHz reads something
like R=80 X=50!

In the VHF range, even a good N-connectorized 50 ohm termination shows
a little tiny bit of reactance. R=49, X=7 or something like that.

From 1.7-30 MHz my 200 ohm load reads R=200, X=0. Up to about 60 MHz,
a little "reactance" creeps in, some of which may be genuine
(connectors and adapters), but much of which is simply due to the
bridge being substantially off up there.

If you want to do experiments with the '259's capabilities and plot
resistance and reactance curves, work on HF instead...

That said, if you're doing this through coax, try it again without and
your results might make more sense... you are "close" to 50 ohms
resistive...

Dan