Oh! I should add, just for completeness,
1. After the antenna is matched (near 1:1 SWR) feed-line length doesn't matter (up to the point where matched-line loss is significant), and
2. Wind coax thru a toroid a few times to make a choke, near the antenna, so the shield of the coax, and the nano, are not part of the radiating structure.
73, --kv5r
