Loud humming when I connect my DVD player

I used this product to suppress hum from directv hum with sat cable. When I placed Jensen between coax and sat receiver, it reduced hum 80%, but it failed to pass sat signal, kept getting 'searching for sat signal' error. What works for sat signal hum, new problem since added marantz 7005 processor into rig, never had hum before. Help, please

Dear Jim; thanks for your thoughtful and thorough response. silly question: how do I identify the ground block on my Satelite dish cable system; and where might it be? What does it look like? Is it where the 14g cooper ground wire is coming out of? Where would the main grounding block be for the electrical service panel coming into the house? thanks again...hard to believe I have no knowledge of this stuff; but ask me about tubed vs solid state, vs digital vs music servers; that I have opinions on; not how the electricity and grounds can screw up my expensive rig...

Jim; great response; you must have an electrical background; appreciate your knoweldge. I will call my electrician who ran my dedicated 20amp lines; and have him help me; don't have a tall enough ladder for Satelite; nor do i feel comfortable performing these things on my own; more after I get help and attempt fix.
Happy Thanksgiving..hopefully no more humming...