Hi Jesse. Welcome to RC flying. I'm sure you will enjoy this hobby as we all do.

Normally, servo's will chatter if the transmitter is not turned on. Turn on the TX then turn on the RX (in that order) and the chattering will probably go away. This is the normal process, TX first then RX. The problem this poses is that you must be aware of others that may be on your frequency (channel) when you are at or near the flying field, so make sure you observe the frequency control at your particular field.

Another thing that may cause the servo's to chatter is if the battery is fully charged, in other words, right after fully charging the batteries, the servo's may chatter a bit. This is normal and will go away a short time after. Note, all of the above from others is all correct and should be done on a normal basis. I range check my TX every day that I fly, as soon as I arrive at the field and get setup. It's a good practice.

Anything else might prompt you to do such things as check the routing of the RX antenna.

To explain that, most modern ARF's and kits have wooden dowels with metal rods attached for the linkage to the rear of the aircraft. This is fine. A few have totally metal rods from the servo to the horn on the elevator and rudder. If you put an antenna inside the fuselage and run it parallel to the metal control rods, you MAY (note may... not will) have a problem, especially in certain conditions when the TX signal lines up with the parallel control rods and the antenna either with the signal perpendicular (aircraft traveling directly in front of you left to right or right to left) or when all are parallel (going directly away or directly toward you). Another problem will exist if you have a metal rod from the servo to the throttle if the throttle on the carb is also metal. It is best to use something like a Sullivan rod that is non-metalic with the conversion from plastic or nylon to metal on the extreme ends of the rods then to a clevis. Or, you can use metal rods with plastic or nylon clevis's. Metal to metal can and may cause chatter from noise inteference at the vibrating engine.