Height will do you the world of good.
I hope to raise my antenna another 3-5 feet(I have the pole, just need the time, maybe Monday). I have a lot of apartments and a Bay Ridge terrain blocking me(I am less than 100 ft AMSL). I can get 50-200 reports 200+NM away to the North West. I have a 75+ degree block to the south caused by a bunch of apartment blocks(two are 14 stories, most are 6)
Here is the info on optimising gain.
ads-b-flight-tracking-f21/gain-adjustment-t37172.html?hilit=optimize%20gain
My gain testing
June 9th gain testing
===Totals===
Gain, Messages, Positions, Aircraft
49.6 306474 8992 460
48.0 304988 9485 466 Most Aircraft
44.5 311587 9461 454
42.1 319091 9868 451
40.2 321087 9652 454
38.6 331688 10167 450 Most Positions
36.4 334498 10152 448 Most Messages
I went with 38.6, most Positions.
Here is stuff on Joe’s Scripts.
ads-b-flight-tracking-f21/ads-b-receiver-project-setup-scripts-t36532.html
They simply install a few feeders and dump1090-mutatbility, plus some nice graphs.