Dear vlsi technology,
consider metal1 , consider a net passing in metal1,
let one end of the net is connected to gate of the transistor the other end must be connected to either source or diffusion they twomust be connected thro metal1.
gate is the receiver and drain/source is diver . so there must be a connection between driver and receiver
now consider one end of the net is connected to gate , if metal1 is not yet still deposited means process is going on , the other end of net which has to connected to the diffusion thro metal1 but will not find metal1 since its under deposition.
so this net is left as floating. during etching a process of depostion this floating net will get enough charge accumalation, to break down the gate. this is antenna effect.
hope u understood
if not get back