What is the Amount of Signal Loss of the Splitter 3? (CM-3213HD)

Insertion loss for the Splitter 3 (CM-3213HD)--1 port -3.5dB and the remaining 2 ports are -7.5dB each.

For an in depth explanation of splitter characteristics please check out How Much Signal do I Lose Using a Splitter? (CM-3212HD, CM-3213HD).