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A shopping trolley would be a good one - at least it will remain portable!!!Well you could always get a really huge antenna for broadcasting, like unscrew the case, and take out the antenna, solder a piece of copper wire to where the antenna was, and the other side to say, a light pole, or a satellite dish, or a car, or anything that is really really big, and made of metal, perhaps piggy backing on a cell phone tower would work.
A shopping trolley would be a good one - at least it will remain portable!!!
I saw a youtube video about increasing the range of a RC transmitter. Basically, you build a reflector to install around the antenna to increase the gain. You would have to know where the other person was as you would have to point the antenna to them. But this is low cost and will increase range.