We’re phasing two dipole antennas together on our repeater system, but we need to add downtilt – to move the main lobe down toward our main users.
This is how you build a delay line to accomplish this using a NanoVNA.
Equipment in this video
NanoVNA SAA-2N 
https://geni.us/YPOGD0
NanoVNA H4 https://geni.us/SqRmO
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Chapters
0:00 The problem with our new antenna
2:28 The solution
4:25 How do we do it?
7:25 Maths…
10:49 The delay line
11:57 Using the NanoVNA to measure
16:37 Testing another cable
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