Sling Media Sling Slingbox PRO-HD SB300-100 - Manual (Page 10)

STEP 3: CONNECT YOUR COAX SOURCE
Coaxial cable carries both video and sound. They're used to
connect antennas or to some cable TV systems. Connect your
coaxial source to the jack labeled COax In on your Slingbox
PrO-HD.
If your coaxial a/V source is already connected to your TV with
a coaxial cable, disconnect it from the TV and then re-connect
this cable to the COax In jack on your Slingbox. Use the
matching cable included with your Slingbox to connect to the
COax OUT jack on the back of your Slingbox, and then to the
In jack your TV.
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