Just my 2 bobs worth, I live in Cairns , so am surrounded by mountains, my range is limited by this , so no amount of changes to my antenna set up will give any increase in range, just a sad fact of the ADSB transmission limitations,
When looking for an external ADSB antenna i visited my local communications experts at Austek , and had a good chat with their technician he said that as my set up was a "none transmitting" set up the actual ADSB freq of 1090mhz did not have to be met, and i ended up with a home GSM mobile phone antenna which tops put around 900mhz. It came with around 20 meters of low loss cable attached and is fully weather proof, its been up on its pole for years now and works just fine , I not saying its the be all and end all in antenna setups, but its a cheaper alternative as it " works out of the box"
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