Use of HF radio Tenerife to EGCC.

[magpienja]

I often listen to airband HF on a receiver I have at home...of late I often hear the likes of Easyjet and Ryanair make calls on route between Tenerife and Manchester on shanwick HF,

I would have thought that a/c on this route would always be in range of a VHF ground stn...or am I wrong,

Hoping for an answer from a professional Pilot.

Nick