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I totally agree with the what is being said and that is a good read if you read all of it and also understand all of it!!

If all of the system is a 50ohm system, whether it be an antenna or dummy load, the length of coax being used shouldn't matter as long as the entire system is matched at 50ohms.  Correct me if I am wrong with saying this.  And thus any length of coax can be used for tuning.  Only when a mismatch occurs does it create a situation in which coax length will matter.  Am I on the right track or way off here guys???  Please any reponses are welcome!!  Thanks much.