autopage rf 425 lcd

Hi, I am thinking of buying the Autopage RF-425 LCD off ebay. I can't find the installation manual for it online but I found one for RF-420 LCD. I assume it would be the same. Looking at the installation guide for the RF-420, I see that there's a 2-way transmitter antenna. It says, "The transmitting/antenna mounting location should be the upper left or lower left corner of driver’s windshield. For optimum range we suggest that the antenna be mounted as shown in picture to the right. (Antenna tip facing up)" Now, does it mean the antenna has to be outside of the windshield or inside? If it's inside how would a person be able to click the button on it to page me. If it's outside, won't it be damaged easily? Also, what way can I install it to have at least 6 feet of wire being straight. Thanks! RF-420 LCD installation guide http://www.autopageusa.com/resources/RF420%20INSTALL%20manual.pdf Picture of the RF-425 alarm system http://www......com/pictures.php?id=17919

Antenna mounts on inside of windshield...page buttons is for your friends for when you say  'Im just running right in,will only be a sec"M.E.C.P & First-Class

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