The “Wardog TRN” is a radio repeater UAV made by the Ukrainian company Roboneers.
It can carry 3 kg of retransmission equipment to a height of 900 meters and stay there for one hour.
This yields a radio horizon of 120 km (d ≈ 4.12 × √h), handy for controlling mid-range UAVs.
Russian blogger Alexander Karchenko describes how increased Ukrainian mid-range UAV attacks this year are decimating Russian logistics:
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[Russians are hit by Ukrainian “Hornet” strike UAV]