WPS100/1
WPS = Wolsey Power Supply
100 = 100 milliamps
/1 = 1 output
This is the power supply that sends 12V @ 100mA up the coax cable to where the amplified splitter lives
If you have the attenuator then it can be fitted in one of two places. It can either go somewhere in-line between the WPS 100/1 TV output and the TV's aerial input. This will change the signal level for just this one connected TV. This would be where you'd put it if the Panasonic was the TV connected to the TV output socket.
Alternatively, connect in-line on the aerial cable incomer going the UHF IN on the aerial distribution amp. So, this would be the wire from the roof/loft aerial going to the amplified splitter. This will then adjust the signal level for ALL TVs in the house.