Originally posted by Xanderix
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This antenna should help - it is the Active Diapason PCB antenna. It is smallish, has SAW filter that can block GSM signals and ensure you get 1090mhz, comes with a LNA that gives you about 21db gain so is good for long cables and you can use a H155 20m cable (long enough?) from the top of the tower to the ground. It isn't cheap, but it will fit your description well especially you are thinking of getting the radarcape.
Here is the link http://www.shop-modesbeast.com/epage.../Products/1401 or http://h2204566.stratoserver.net/Sma...z#.U5JUN_mSx8E
I recall a post in Aussie feeders that a user also uses towers to place his ads-b antenna and the receiver could not detect the mode s signals as it was overwhelmed by the GSM frequencies. Only Using a preamp with build in band pass filter/front end filter sorted that issue. Link: http://forum.flightradar24.com/threa...ll=1#post52030 But the context here is he is using a mode s beast, which is a very sensitive receiver as designed by Gunter. Not sure about the dongle though, but there will be an effect on 1090mhz reception I suspect.
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