can you tell me what exactly a dive bomb is and how its made?
do you need a wammy bar and a tremolo arm to do it?

please tell me
A divebomb is best done with a floyd rose or any other description of locking tremelo and locking nut, it can be done to a degree with vintage style strat trems but not to the same degree as locking trems. To put it basically a dive bomb occurs when you hit a note and manipulate the pitch of that note with use of the tremelo arm, bending the arm towards the body will lower the note and vice versa........

Hope it helps
Ive got a couple of pictures on how to do it.

Step one:

Step two:
Been away, am back