Guys...
I think that i have posted before also about this. From personal experience, i know that unity locks, tracker, steering locks, remote locks, chor switch, are no good !!
You need to hire a reliable watchman or guard with gun in ur street. That is the only method which will deter them. Personally tested. Rest of methods are are for ok if you park ur car at market etc for short while but for night, you need to arrange an armed guard in ur neighborhood.