This is a bit of a puzzle. All the Freeview channels work fine on the Humax box, but when we are using the TV some of the channels break up. If we turn the Humax off all seems ok. The Ariel is fine, it has a amplifier connected which feeds one more tv. The amp is in the loft and power is fed from a box plugged in to the mains socket behind the TV, power goes through the the coax to the loft. It was fitted by Ariel rigger about 3 years back. I have checked all the settings on the Humax and the power feed to Ariel in settings is off as it states it must be off if another power supply is on. If I disconnect the Freeview box and connect Ariel direct to TV everything works fine. Any suggestions appreciated. Thanks