David,

If you read back then you will see you have contradicted yourself, which means that to me the manual is not completely clear.

At first you said that you can't cut off less than the length of the whip (i.e. making the overall aerial longer). Now you say as long as it is 1m then you are ok? Which option do you want to settle on?

Also the mention of 1m is in the heli setup and not mentioned in the airplane part.

Why can't you just answer the polite questions without getting your knickers in a twist?