ECM Missiles suggested by the opening post...uhh...
If you give the EMP Adv. an EXTREME amount of range, you've got what you want. Except it doesn't do the fighter-scrambling crap on capships (I got a bunch of Vajras to shoot at my Aeolus with Shrikes before, EMP'd my turrets so I had to call for several Atalantas to eat the Vajras).
For defensive EMP/ECM missiles, I really, really, really do love that idea. Even though I mount the BP Raynor's missile turrets with EMP missiles, they never seem to hit, or even want to lock onto incoming torpedoes. Occasionally torpedoes get disabled to 0 speed by luck of chance, but...heh. Believe me, if you mount the GTM Tempest instead and if the launchers actually target the incoming torpedoes, you get to see an impressive screen of almost flak-like fire.