I have recently installed an Argos Digihome recorder. Previously using
just a Digi box the TV used to receive Freeview perfectly.

Now with the Digihome recorder it still receives Freeview perfectly
until you attempt to record something. It then has a stuttering effect
on the recording and on the channel that you are trying to watch. I
have had it replaced and still same problem. The new box also seems to
work perfectly at a different location.

This leads me to think there is a signal problem once you start to use
2 tuners. Do I need to replace the aerial or would a signal amplifier
solve the problem? Or is there another solution?