Any idea how many 1090 verses UAT out there are?

that in turn leads to questions about your coverage. You can likely see 1090 much further out than 978 (which fly lower). For me, I have about 5-10% UAT count compared to 1090ES. But I can see 1090 all the way from Bakersfield to the Oregon border (a 10-ish hour drive by car). UAT I can see from Sacramento down to San Jose or so (about a two hour drive by car). That affects the fairness of the comparison