POOR range on keyless entry 97 villager

My villager gets the worst reception on the keyless entry system. I have to almost be in the car for it to work. I have changed the batteries several times and still no good. I have tested and replaced the remote with another. I have also tested my remote on a friends and it works great. I also have the aftermarket dealor option for ignition kill and siren. I have removed it and still no good. What can it be? Where is the antenna for the keyless entry. Yes my antenna is there.