Hi NGgrandad, welcome aboard!
2,4Ghz is nothing like the old 27mhz and 40mhz radios of yesterday. The ariel is only about an inch'ish long and will fit anywhere. DO NOT solder it to anything. That is old school radio control.
You can even put it inside metal live steamers and it will still work fine. I fit these units commercially as part of the Houston Gate Locomotive Work
www.hglw.co.uk
There is plenty of good advice around, but if you want anything specific send me a personal message. Advice is free.
Regards,
David H.