There are 3 types of amplifer switch (I am assuming you are talking about the pre-amp in the over the air antenna,, If you mean something else please specify)
Common are a wall plate, this now comes in 2 versions.
1: is a plate with a 12 volt outlet, an antenna connection a switch and a Light.
the other is the winegard Sensar pro, all connections are on the back but it has 3 buttons a column of lights (only on at a time) and two digital displays. Both are the size of a standard duplex outlet plate.
The other common one is a box of many buttons, USUALLY the left hand one says POWER and the others are grouped TV-1 (or main TV) VCR, TV-2,TV-3 AUX
and in each group are buttons for DVD, CABLE, SAT, Antenna, VCR (Save no DVD or VCR on the VCR group) to activate antenna turn on power and select antenna.
VERY RARE is a plate with just a switch and LED, note, this is the winegard offering, A body builder can use any simple toggle switch.
In this type (I have seen exactly one of these) the connection to the coax is a small cube hidden in the wall somewhere.