Why make the wires protrude or have an external antenna? For example, let's take the Motorola RAZR cell phone. No external antenna, but it transmits radio waves just fine. No protruding wires b/c there's a circuit board inside.
You could fit a circuit board inside a plastic bag dyed same color as gatorade. The antenna is just a long steel wire, since signal wont have to go 30 feet (cabin to baggage hold) you'd be ok with a small one. Get that stuff inside the bottle, and fill bag with air so it won't move around in bottle. Get it behind the label so it wont be seen. Liquid above and below it will still slosh around, so it looks normal. Disolve the C4 in the gatorade and pour in. a watch battery for power.
Disclaimer: Don't do this. I am not advocating nor do I in any way support the constructing of such a device. If you do it's not my fault. This is for informational purposes only.
Edited 1 time(s). Last edit at 08/12/2006 03:48PM by KeepOnTruckin.