Shove the eggfinder and a battery into a short piece of bt-55, pack it in with foam, tape over the ends with duct tape, and zip tie it to the shock cord.
Problem solved.
That is a down and dirty way to do it and could very well be pulled off if placed on the apogee harness. The BT-55 should be long enough to encompass the EggFinder and the antenna. You don't want the antenna to get bent up or squished down or around.
An SMA or RP-SMA antenna would be more robust in that regard. Remember that carbon fiber tubes will attenuate the Rf off of a tracker significantly. Even the black "profusion" tubes though they are not CF have carbon black added to the substrate and that can attenuate a signal. Ejecting the tracker out at apogee into free air like Matt mentions above is ideal as far as range reception is concerned.
With the EggFinders, one might not get as many positions decoded on a dual deploy rocket that is at a distance and falling under drogue. For that reason, I set my main to blow at 800 feet or higher. Once the descent rate slows and the EggFinder antenna
is oriented more or less vertical, that's the time when the positions will start to come in more reliably and that's when you need 'em to get that initial and final location prior to touchdown.
I find the Ham APRS Trackers (BeeLine GPS/Ham band) have more robust packet/altitude reporting but that only is transmitted once every 5 seconds. I've tracked high flying rockets with APRS at 12k' under drogue and due to the vagaries of radio propagation
sometimes only receive position packets every 10 to 20 seconds instead of the expected once every 5 seconds. In that case too once the rocket is under the main chute at altitude, the decoding of the APRS packet can occur more reliably. The Beeline GPS tracker can of course store the positions at higher a rate to onboard memory for later download as a .kml file for Google Earth display. The once every 5 seconds transmission is more than adequate to get
a general track and find ones rocket.
I do both types of tracking and like them both. I have no reservation recommending the EggFinders to folks with no interest in getting a ham license but the technician's ticket opens up more options plus one will be able to learn
a lot about radio propagation. That does transfer to good use to rocket tracking.
I've used Windows software to track EggFinders in real time on a map and can get reasonable positions plotted but the reported altitudes are spotty. I saw some improvement when using a high gain receiving antenna but again the reception seems much more reliable once the rocket is under the main chute. The SirfIV GPS chipset used on the EggFinder is great for positioning but kinda sucky with altitude reporting with dynamic flight. The name is EggFinder and it does just that. It will find the rocket. Not advertised as an altitude reporting device. I've considered my WinBlows software might be at fault here and have a linux solution (Xastir) I am hoping to try with the EggFinders soon.
The TRS is a different bird here. If the packet is decoded the altitude from the baro chip is sent. I found with my one TRS flight when packets were decoded, the altitude seemed more reasonable as opposed to what
I've observed with the plain EggFinders. Then again, the behavior I describe above is generally what is seen with the TRS too. Once under main, the positions are more readily heard and decoded.
I've had three totally sight unseen Eggfinder flights with one ballistic and found them all. The ballistic was a glass rocket I walked up to the fincan sticking out of the ground. I would have had no idea where to go otherwise as that
last position got out at 50 feet above the ground was good enough to find the rocket. Kurt