SMA Antenna Telltale

I use a TBS CrossFire Module with my QX7 together with a Diamond antenna. I cannot transport the TX with the antenna attached, and it is quite easy to turn on the TX and use it within a short range without the antenna attached and without noticing. Although the Crossfire is renowned for its robustness in this respect, it is not a good thing to be doing. I created this as a simple reminder that I need to attach the antenna before I power on. The 3D part is a TPU push/twist fit which I attach