I have a 31 foot vertical myself (S9 V31) and since I have the KPA500 I use the 600 WATT MFJ remote auto tuner. With about 8 radials of 30 ft it works well on 40m - 10m. The MFJ can't tune it on 80m but the internal K3 tuner does. Feedline is 100ft of RG213 some more pics here http://qsl.net/k6te/antenna.htm