Static interference

I have an amp in the lounge for surround sound, working just fine, and a set of two speakers off the amp running out to the patio (the amp has a switch that allows for this, no 'custom' set up). This also has been working fine.
On the weekend I wanted to have the kids watching the TV (using the TV speakers only, not surround sound) while I sat outside listening to the cricket. Once the TV was turned on, this created a huge amount of intereference in the amp rendering it useless for outside listening.
Does anyone know if there is a way to get over this issue?
On the weekend I wanted to have the kids watching the TV (using the TV speakers only, not surround sound) while I sat outside listening to the cricket. Once the TV was turned on, this created a huge amount of intereference in the amp rendering it useless for outside listening.
Does anyone know if there is a way to get over this issue?