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@allObjects
In regard to the sister blog entry about LoRa Gateway Antenna Upgrade:
I'm surprised that the aerials are horizontal and the significant length difference between them and the wip.
For regular 1/4 wave length ground plane antennas with standard impedance - 50R - the (four) aerials point about 45 degrees down and wip and aerials have about the same length. See M0UKD's 1/4 Wave Ground Plane Antenna Calculator.
Do the supplier(s) of your upgrade antenna and the gateway mention: