i tested out to find what you need to change first you need change this to true
terminalManeuvering = true
for what i tested it let the missile change it course on final phase, second you need to set your antirad targets with this bit of code
antiradTargetTypes = 0,1,2,3,4,5
it's exact like the rwrtype config on radars but this time what kinda of radar it would target, here a list if you don't remeber
0 = SAM site radar
1 = Fighter radar
2 = AWACS radar
3, 4 = ACTIVE MISSILE
5 = Detection radar
6 = SONAR
and this is kinda useless since it's isnt ARH on it's terminal phase
radarLOAL = true
here the test missile i did using a HQ-2 as base from kerbal field