The only corn we grow here is for silage, and I don't know anything much about the agronomy and assume that it doesn't get that much, so we'd not spec our sprayer to deal with it. A metre or so clearance is normally plenty to cover oil seed rape and beans which are the tallest crops we normally grow. I think the Fendt Rogators are different to the Rogators you get, I think ours were from te Netherlands originally before Agco bought them

https://www.fendt.com/uk/agricultural-machinery/crop-protection-sprayers/fendt-rogator-600?gad_source=1

https://www.batemansprayers.com/

https://www.agrifac.com/uk/