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2 comments of this product found across Reddit:

1 point

1970-01-20 10:10:27.707 +0000 UTC

I have a 60' spool of the KMR400 stuff off Amazon Exact Link. I'll put my NanoVNA on it tonight and see what S21 measurements I get.

2 points

1970-01-20 10:13:35.908 +0000 UTC

Thanks for following up. Turns out I have 60' of this stuff.

Band	Insertion Loss (S21)	SWR (S11) Max
2m	-0.75 dB	1.124@148M
70cm	-1.81 dB	See for yourself

70cm mins out around 1.16 SWR and the SWR frequency is ~8 MHz.