One of our members has recently been told that he could benefit from the above device. Unfortunately even the professionals do not seem keen to give advice as to the immunity to Amateur Radio, saying 'we have never come across it'. I find this very hard to believe and would welcome any advice from the committee or members of the society which would help me to make a decision. Many thanks in advance. Name and call sign supplied If you have advice post it here and I will ensure it gets back to the author.