Editing Electronic counter-countermeasure (section)

===Radiation homing===
Another practice of ECCM is to program sensors or seekers to detect attempts at ECM and possibly even to take advantage of them. Specialized [[anti-radiation missile]]s (ARMs) have existed even before modern jammers to target radar sites and they can be repurposed to target ECM.<ref name=harm>{{cite web|title=AGM-88 HARM|url=https://fas.org/man/dod-101/sys/smart/agm-88.htm|access-date=20 May 2014|archive-url=https://web.archive.org/web/20140707093804/http://fas.org/man/dod-101/sys/smart/agm-88.htm|archive-date=7 July 2014|url-status=live}}</ref> The jamming in this case effectively becomes a beacon announcing the presence and location of the [[transmitter]]. This makes the use of such ECM a difficult decision – it may serve to obscure an exact location from non-ARMs, but in doing so it must put the jamming vehicle at risk of being targeted and hit by ARMs.

Some modern [[fire-and-forget]] missiles like the [[Vympel R-77]] and the [[AMRAAM]] use a combined approach, by using radar in the normal case, but switching to an antiradiation mode if the jamming is too powerful to allow them to find and track the target normally. This mode, called "home-on-jam", actually makes the missile's job easier, as the jammer usually puts out more power than normal radar return would.