Ok first let me state that I know next to nothing about radios. That being said I figured that this would be good place to ask my question. I have purchased 23 acres of land about 4 miles from my home and one day the money gods permitting would like to build a new home on that property. However that is a few years down the road for now I will be content with my own private rifle range and campgrounds. I love having a piece of land to call my own. I have dreamed about this type of haven for years however I have a problem (besides problems getting to the point). There is a broke down old farmhouse that is a magnet for bottom feeders I have chased kids out looking for a place to party, found meth labs remains as well dealt with theft of almost every useable fixture in the house (I mean stealing a mans toilet that's low). I also have an outdoor fuel tank and a barn with machinery that I dont messed with. My idea is a product called Dakota Wireless Driveway alarm it consists 2 watt MURS transmitter with built in I/R sensor and a home "Base" station transceiver that picks up the signal from the sensor as well allow two communication with a hand held monitoring unit. Ok here is my question the transmitter in the sensor unit is said to be good for two miles in wooded or hilly terrain and 4 miles flat. The terrain between my property and my home is cornfield and small stands of timber and a few small rolling hills and terraces. If I attached the sensor unit to external pole mounted antenna (FCC reg. state no taller the 60 ft) Do you think this would extend the range to 4 miles under the conditions that I stated? Would I also have to connect the base station to an external antenna and perhaps mount it the roof of my house (I sit on top of a hill the highest spot in my town) Thank you for your time and consideration I look forward to your replies.