Well, the head jammer is just like a regular jammer, except a localized effect. So if a TM has the ECCM complex form, greater than the jammer rating, there should be no problem. The TM would just edit out the interference. However, if the ECCM rating is lower, than there will be problems as no connections are possible. I would also penalize any attempts to thread an ECCM form to defeat this, as there is static in their head.