Signal loss / poor range on Absima CR4T radio - sorted

[Ashlandchris]

I had recently bought a 2nd hand radio as above as I had previously been using an Absima CR3P and had liked it but had been advised the 4T gives more setting to improve control. I installed it fine in the same way the 3P had been but the range seems very poor. Once the car was more than approx 3m away the signal was lost. I tried a longer antenna tube with arial fully inserted (with the 3P I only had approx 5mm extending above shell and it was fine) giving a good 70mm of arial, but his made no difference. Is there something I was doing wrong? It works fine close up so is correctly bound, but just cuts out once car goes >3m from me.
Has anyone else had this problem?