The AA.109 is provided with a one stage low gain LNA in order to be compatible with modules that have an integrated LNA with no automatic gain control. Examples are Navman modules Jupiter 3 Jupiter 30xLP, Jupiter 32xLP, Jupiter 31 and Micro Modular Technologies MN1818, MN3310, MN5010HS. Using a high gain GPS/Galileo antenna such as Taoglas AA.105 can deliver too much gain when using these modules. However please note that there are losses in antenna cables and connectors and it is not advised to use the AA.109 with more than 3m of cable.