Perhaps some of you would love to have some sort of early-warning system for your retreat;
something like radar, that would give you maybe ten or twenty minutes warning of the 
aproach of one or more helocopters.  Well, maybe you just might be able to do just that, 
and at a relatively low cost.  Marine radar systems are available through mail order 
catalogs, and over the internet.  Two examples are given below, that are distributed by 
West Marine.  I am not their representative or a dealer, but at these prices, you might 
want to check it out.

The first is the least expensive they sell, and has a range of 16 nautical miles.  The 
second, which is at or near the top of the line, has a range of 32 nautical miles.  The 
third one is good to 48 nautical miles (Si-Tex T-280, WM Model 253767).  They all have 
rather small, easy to camo, antennas. They typically come with alarm setups in the display 
console that tell you when a target comes into range.

Of course, I can make no claims as to the legality of using marine radar on land 
(especially if it should interfere with aircraft navigation).  This should be something 
you should check out, yourself, and judge according to your particular situation.  
Page 53 of their catalog has a nice article on selecting a radar.  There is more to it 
than range, price and power.

                    Mfr: SI-TEX
                    Mfr Part#: T-150

                    Description: T-150 LCD Radar

                    West Marine Part# 314478

                    Only:
                           $ 1099.00 
http://www.iwol.com/cf20customers/westmarine/mall/Display.cfm?PID=5743




                    Mfr: RAYTHEON ELECTRONICS
                    Mfr Part#: R21XX

                    Description: RADAR-R21XX 32MI

                    West Marine Part# 572743

                    Only:
                           $ 4299.00 
http://www.iwol.com/cf20customers/westmarine/mall/Display.cfm?PID=5752




                    Mfr: SI-TEX
                    Mfr Part#: T-280

                    Description: 4KW RADAR-T280 48M

                    West Marine Part# 253767

                    Only:
                           $ 3999.00 
http://www.iwol.com/cf20customers/westmarine/mall/Display.cfm?PID=5756