All the wire needed is provided in the kit. If for some reason you need more, you could just use the same as what came in the kit. On the other hand, as mentioned in several posts, some are using a smaller size wire with good results, esp on T1 on 80M. #30 is a suitable sub for #28.
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Wes
AE6ZM
Hereford, AZ
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Wes WB7BR