Leadslead...I know..Guess who you sold your T28 to
You have been trying to poke holes in availability, cost and compliance for years, Leadsled. Why not wait a little bit and see who is correct. ModeS is not the big ARINC system that you remember from your classic days, ol' fella.
There have been billions of electrons, ones and noughts crucified on this subject already so will not go over old ground. Suffice to say, with combination of Aussie tested WAMLAT and ADS-B and Primary radar around the major cities, AirService's side of the deal is coming together quite nicely. Upper airspace ABV FL300 and a huge swath of the continent covered at A010(where there was absolutely ZIP before)...it doesn't take rocket science to work out which classD towered aerodrome is also going to get a receiver