If you are fortunate enough to own an SZD 55-1, mount the FLARM in the tail battery box. Bond the FLARM antenna to the vertical stab just below the metal parts of the horizontal stab. Bond the ADS-B antenna to the vertical stab just above the rudder counter weight. Makes for very short antenna leads. Use the existing battery cables to power the FLARM from a new battery box mounted to the stbd side of the main gear box. Now for the hard part, fish a data cable forward to the FLARM display of your choice.