Back to the original question, I have been spending way too much time discovering the shortcomings of the Meteo* products and their AcuRite interfaces over the past few days. If you look at the "system" tab in MeteoBridge, there is a Messages pane at the bottom of the page that shows some interesting debugging and informational logs. Mine displays these three lines whenever the data logger starts:
logger (17.09.2014 19:02:23): station 0 (AcuLink): multifunctional sensor 02935 already registered (th0/rain0/wind0).
logger (17.09.2014 19:02:23): station 0 (AcuLink): temperature sensor 08607 already registered (th5).
logger (17.09.2014 19:02:23): station 0 (AcuLink): multifunctional sensor 01065 already registered (th1/rain1/wind1).
From what I can tell, the device names in MeteoBridge match up with those used in the larger/older MeteoHub package. th0 was the first temperature/humidity sensor detected, and th1 was the second one detected. In my case, both th0 (on mast) and th1 (smashed on ground) are 5-in-1 sensors. For some reason, the software starts numbering "tower" (cheap temp/humidity standalone sensors) starting at th5. If you are picking up th5 and th6 an don't own any tower sensors, then perhaps the AcuRite radio protocol travels further than expected and you are picking one up from far away?????