As much as i loved to use the FSLTL injector, every time i compared the position and altitude of a plane with Flightradar24 and ADSBexchange is saw significant differences.
E.g. a plane enroute from USA to GER just flying by Island was displayed on 38.000 ft in FR24 and ADSBexchange whereas LSLTL injector showed it descending to 34.000 ft and below - not mentioning that the lateral position was way off aswell.
Running my own little ADSB-receiver, I am currently developing an ADSB injector with focus on realtime and precision.
If we could manage to get people owning an ADSB-receiver to feed data, it might become a nice community project - independent of big players and free of charge.