Ukraine has an advantage America does not: Ukraine has access to Chinese drones, Americans will have much harder time going to Shenzhen to buy FPVs.
LOS also isn't an issue, infact Fresnel zone clearance is much better in mountainous areas which can theoritcally achieve even greater range than from flat ground. It also just take a single fiber optics repeater to allow the operator to hide behind a hill.
But I'm not surprised Americans have no concept of what modern warfare looks like, it took them 3 years and thousands of lost vehicles just to figure out FPV is a thing in Ukraine.
Now that Ukrainian entities are part of the US military supply chain in ME and beyond, shouldn't they be included in China's sanction on RE etc?