It looks like you have a QND88P
http://www.security.honeywell.com/hs...nel/50028.html
http://www.smarthome.com/8680D88P/Qu...-Jacks-/p.aspx
The coax cables plugged into the yellow ports should go to rooms with TV jacks. Any unused jacks should have a terminator installed (either in the room a cable runs to or at the distribution module.)
On the back of the module there should be an input to the 8 way splitter, that is where your antenna coax should attach. Are you using a preamp, or is an amplifier built into your antenna? If so, the power inserter needs to go between the distribution module and the coax from the attic.
Do you or did you have cable? With the 8-way distribution module, the 2 way splitter is surprising to see. Do you currently have cable internet?
How many TV’s do you have? An 8-way splitter may be overkill if you don’t have 5 or more TV’s.