Radio Shack TRS-80 Operation Manual page 9

Carefully unpack the Computer. Remove all packing material and
save it in case you ever need to transport the Computer. Be sure to
locate all cables and papers that may be included in the shipping
carton.
Place the Computer on a solid surface near the television set you'll
be using. An appropriate power source should be nearby, so that an
extension cord will not be needed.
Do not connect the Computer to the AC power source yet.
Connection to a Television Set
The Computer contains a built-in television interface which sends
a VHF signal to your set. The Computer also comes with an Anten-
na Switchbox that allows you to select either normal
television-station reception or computer input without connecting
and disconnecting the Computer every time it's used.
This Antenna Switchbox is comprised of a short section of
twin-lead cable, two screw terminals, a coaxial connector, and a
slide switch. Make the connections described later, but only
connect one antenna to the Switchbox.
Mounting the Switchbox
We suggest you attach the Switchbox to the back of your TV set as
shown in Figure 1.
Select a smooth, flat surface on the TV set that is well within reach
of the antenna cables, Wipe off any dust, dirt or grease from the
mounting surface.
Remove the backing from the double-sided tape (one side is
already attached to the Switchbox) to expose the sticky surface.
Press it against the back of your TV cabinet in the desired location.
Figure 1. Mounting Switchbox onto TV Set (Connections
may vary, depending on your antenna installation).