Originally Posted by TheBandit
My last electronics guy that did the un install cut the ends of both antenna cables.....I assume just need new coax ends?
the gdl30a does use an antenna w/a coax cable. I believe the connector is a bnc but not 100% from memory. you will need to install a new one...and install it correctly as this connection is important and if it is not done well you will have reception issues. the gdl30a is very old and I would confirm w/garmin and/or sirius-xm that it is still able to receive weather signals (?). I have no idea but would guess that it's a coin flip.
the 4208 doesn't really use an antenna but rather an active gps receiver. this is an important distinction because the cable on an active antenna is not coax and does not use a bnc connector. if the 'gps antenna' you have for the 4208 has a coax cable, it is not compatible w/the 4208. if it isn't coax, then it is either a nmea0183 receiver which will connect via small wires to the pigtail of the 4208 (more small wires). the color codes are in the manual; OR it is a nmea2k receiver that will need to be hooked into a nmea2k network. you will need to buy a field attachable micro c connector if it is a nmea2k antenna (because the end has been cut). if you post a picture of the underside of the 'antenna' then we will be able to tell you which you have.