I put a tinytrack from Byonics in my wingtip in abut 2009 and it has worked flawlessly since then, including places in central NV and remote northern Canada. The only places/times I've not gotten reasonable signals is down low between mountain ranges, or in the BC coast ranges in the far NW. One key is to change the settings to ring more relay stations (I believe it is Wide 2-1, but don't remember for sure. Should be in the instructions). My tracks were limited until doing this. However, if you fly in a populated area (e.g., CA) those settings will cause some consternation amongst the ham radio folk because of multiple hits and tying up the system (I'm not convinced that is a real problem, but I often turn my tracker off when flying over the central valley).
RV-9B (Big tires) Tipup @AJZ or CYSQ