Hi Tony,
I've been doing the KO conversions event since they first came out. I personally use V8R4 and V8R4-11 receivers without any problems. On the early versions some of the aerials are poorly soldered. Next time your at the track I will either re-solder it for you or solder on a new one. I actually tuck the aerial back in the receiver and i have never had any signal issues. You do need a fine point iron to solder the aerials. they only need that 25mm long aerial to work correctly, that the beauty of 2.4
You can use the V8FR-11 hard case receiver but it does take up a lot of space.
The V8R4-11 receivers are fine and work trouble free and cheap to buy as well.
Happy to talk you through it all if you PM me.
Cheers Paul
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