+Installing the electronics in the fin can bay was a *huge* challenge due to the
+restricted space between the MMT and airframe. All of the through-hole connectors on
+both boards were removed, along with the GPS antenna and beeper on the TeleMetrum board,
+yielding two boards with no parts on the "top" side. A short piece of ribbon cable was
+hard-wired between the companion ports on the two boards, and the LiPo battery leads
+were soldered to TeleMetrum. The TeleMetrum board was equipped with an edge-launched
+SMC RF connector (smaller in diameter than an SMA) for attachment to an off-board
+antenna. Then the boards were installed on minimum-height standoffs above the phenolic
+motor mount behind a hatch cut in the airframe between two fins, with the GPS antenna
+and beeper epoxied down to the side of the TeleMetrum board. The battery was mounted
+as far forward as possible and blocked in with some small bits of scrap balsa stuck down
+with super glue. The power switch was mounted near the aft end of the bay such that a
+small screwdriver reaching through the 0.25 inch static vent can be used to turn things
+on and off.
+
+### Fintenna ###
+
+On 2YikStik, one of the big disappointments was a very poor signal from the
+UHF transmitter on the TeleMetrum board mounted in the fin can. This isn't
+surprising, since the antenna was just a wire whip running in parallel with
+and very close to the motor casing. For this build, I decided to try
+something completely different.
+
+The quick summary is that I'm loading up the two fins that don't have thermistors
+in them as an antenna. And it works brilliantly!
+
+Before bagging the fins with the CF and glass lamination, I put 1 inch wide
+copper foil tape on two of the fin substrates, running from near the tip
+down to the root. Then the fins were bagged with 2 layers of 5.7 oz 2x2
+twill carbon fiber and a 6 oz glass sanding veil layer on both sides, all in
+one bagging operation to ensure all the layers formed a strong chemical epoxy
+bond.
+
+After unbagging, while the epoxy was still somewhat leathery, I carefully
+cut the CF back at the root edge of each fin exposing the copper foil. The
+fins were then allowed to cure and get sanded normally. When installing them
+in the airframe, I oriented them so that the thermistor fin is on the anti-rail
+side of the airframe, and the two copper-foil-equipped fins bracket the rail
+side, with the copper foil sides facing each other across the rail-side valley.
+
+After applying fin to fin glass across the motor mount, additional copper foil
+tape was used to join the two fins, soldering the new foil to the foil embedded
+in the fins. I then cut a "gap" in the center of the space between the two
+fins, and installed a 1.5-20pF piston trimmer capacitor with the screw aimed
+aft, and a piece of small diameter teflon coax with two ferrite beads on the
+forward side of the gap. The coax was run through a hole near the root of
+the fin separating this valley from the ebay and terminated with an SMC
+connector to mate with the TeleMetrum board.
+
+I'm pleasantly surprised at how well this seems to work. With a Pro75 6xl
+case installed, the variable cap allows the antenna to be tuned to about 1.3:1
+SWR, and the resulting transmitted signal seems strong...