PPK results with Phantom 4 Pro v.2
We tend to use two base stations on linear jobs such as coastlines and pipelines, leapfrogging the units as we go along and with around 3-4km spacing maximum. The nearest base to the flight is used for the PPK. The spacing is determined by the fact that we are also using them to set GCP and check points and we don't want the RTK dropping out during that operation. If you put the second base up first (if that makes sense) then that sits through three flights as the other base leapfrogs. By that time it should have a good fix. The remainder of the bases then fix between themselves on short lines. On a large job the last but one base can also site for three flights and provide another full fix.
Our jobs are typically larger than Lee's sites, although not as neat and tidy - one advantage of a rotary over a fixed wing - so there is more need to have multiple base positions.