Thank you for replying John, I know next to nothing about radio control law in California and only marginally more about those laws in the UK. What I understand is that the two public frequencies most in use are 2.4 GHz for the aircraft control and 5.8 GHz for the FPV side of things. Unfortunately, the majority of Britain is urbanised and the 2.4 GHz band is extremely crowded by Wifi, Cell phones and various other uses. The 5.8 GHz band is beginning to be quite crowded too with the proliferation of wifi equipment trying to escape the crowding of the 2.4 GHz band.
As I understand things, transmitting equipment for radio control in the UK are limited to 100 mW radiating power and occurred to me that the stock equipment in terms of antennae are prone to quite heavy losses and although my RC equipment uses frequency hopping, even the smallest loss can have a considerable effect on the signal leaving my antenna and being received at the other end.
In fact, from what I have read, 2.4 GHz, 'cloverleaf' antenna are quite popular items for sale in places such as ebay and HobbyKing. Apparently, there are more and more mods being carried out on the transmitter that I currently have (Turnigy 9X) to try and improve range. I am not yet ready to hack into the innards of my transmitter and so as a first step, I thought to improve on the antennae. Although the transmitting antenna is usually pointing towards the aircraft by the operator, it occurs to me that a simple strip of bare wire in the stock receiver coax is at somewhat a disadvantage because of directionality as the aircraft manoeuvres and would benefit from a more omni-directional antenna. From watching various Youtube tutorials, the consensus appears to be that semi-rigid, RG402 coax has quite a small loss and I thought to remove the existing length of light antenna and replace it with a shorter length of RG402 terminating in an sma connector onto a helical antenna would improve reception at every aircraft aspect.
I would appreciate any feedback on what I have written.