No experience with the Chopper Spotter, but you may want to give this one a serious look:
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Recently switched from the Heliporter (have owned several over the years) to the AviGround unit. The Heliporter is a model of superb workmanship, but I have found the AviGround HeliTug to be that and much more. The remote control capability of the AviGround is a game changer IMO. Ease of use is waaay ahead of any similar helicopter tug I have used. Customer support has been world class.
