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In another thread Rich brought uo "Fresnel Clearance." This is an interesting topic and for something to play with here is a link for an online calculator. The calculator's default frequency is 2.4 Gig but you can change it to frequencies in the FM radio band.
Have Fun!
http://www.zytrax.com/tech/wireless/calc.htm#fresnel
Posted : 14/10/2015 8:52 am
Below are three frames from a Powerpoint presentation I wrote before I retired -- which may (or may not) be useful in understanding Fresnel clearance, and its importance at VHF and above.
Posted : 14/10/2015 9:34 am