Dodge OEM Alarm

I have a 2003 Dodge Durango with the factory alarm system, it has decent range approx. 120 feet, I would like to extend the range if possible. How do I go about doing this ??? Does any know where the factory alarm unit is located at or the antenna so I can may extend it and put it behind the rearview mirror ??? I am also thinking of adding an add-on remote start unit to the factory like the Valet 551T or 556T so that is another reason I would like to extend the range of the factory remote. Thanks for any info and help. God Bless.

actually adding to the length of the antenna will not give you much of a gain if any at all, and the keylees entry module is located high high in the drivers kick, alsmost at the gauge height.  I would recommend spending a few extra bucks and getting a remote starter where you do not have to use your factory remote.2005 Toyota Corolla S

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This is likely a lost cause. Factory units tend to be pretty well tied into the car and not very changeable. Also, the limiting factor may well be the transmitters themselves... Sorry to be so negative-- just hate to think of you going to a lot of effort for nothing, Many add-on units come w/ their own remote that you could use instead of the factory and that would give you much greater range. For instance, the rattler 369D... Me