The last step in most Automatic Dependent Surveillance-Broadcast upgrade strategies is installation, but it’s an important consideration that should be evaluated up front. Even upgrading a Garmin GTX330 to a 330ES requires some degree of wiring, testing, etc. With most avionics shops booking work more than 6 months in advance, now is the time to plan your installation. There are many ADS-B hardware options to consider, including Garmin’s GTX 330ES/335/345, L3’s Lynx-series, FreeFlight Systems’ RANGR series, Trig Avionics’ TT31, Bendix/King’s KT 74, and Appareo’s Stratus ESG transponder.
Source: aopaADS-B installations: Plan ahead