Are there any advantages using dedicated Z-Wave Extenders?

[JoeJ]

@Stu_The_K

Out of curiosity, did you try the antennas from the C-7 mod on the C-8 before you gave up on the C-8?

Yes. I did a lot of testing
https://community.hubitat.com/t/testing-results-of-z-wave-antennas/118062