I have an Outback Outreach .. IDENTICAL to yours, etc. for one band coverage and wattage difference.http://www.alphadeltacom.com/pg5.htm
ALPHA-DELTA is the US Distributor, they have all the inforamtion you require (including instructions and sapre parts). A Telephone call is the best Support and quick response!
Alpha Delta Communications
P.O. Box 620
Manchester KY 40962
Voice: (606) 598-2029
FAX: (606) 598-4413
You have got this antenna assembled incorrectly !
The "WL" Wander Lead socket should ALWAYS be oriented to be at the BOTTOM of the LOWER 4' mast section. The UPPER 4' section screws on to the threads of the lower section and then you have the adjsutable whip anetenna. It attaches with a ferrule at the UPPER section.
The Bottom mast is a 3/8"x24 SOCKET and you require a 3/8"x 24 long stud to thread into it a standard 3/8" base mount that sits on the Outpost.
IF you are missing parts, Alpha-Delta can orer from Australia or Tower Electronics for common antenna parts.