Hi, I may not have the terminlogy correct, but I hope you can follow. I made an endfed coupler: http://www.aa5tb.com/coupler2.html and used a capactor from a transister radio. I now find that it doesn't work with 5Watts, and was told it isn't 'man' enough. I now have to get one that can cope with higher wattage. I have a few tuning caps, somw of which are quite large, and I want to know how to choose one that is just 'strong' enough. Can anyone shed light on this please? Cheers, Camerart.