I recently licensed a pair of frequencies - 153.*** and 159.*** - for putting up a repeater; I'm looking for advice on where to locate a good antenna and what type to use.  I'm thinking something such as:

 http://www.wiscointl.com/decibel/dipoles/db224.htm

I have not called about that one but something along that line (except it is uhf) runs pretty high on ebay:

 http://cgi.ebay.com/Andrew%2fDecibel-DB420-B-Base-Station-Antenna-*NEW*_W0QQitemZ390010391289QQcmdZViewItem

I'd like to think I could find something like that used.  Anyone have ideas for where to look for used antennas other than ebay?

I have an antenna that may be the same as above except it only has two trombone elements.  It is on a 30 foot tower; I believe it needs some minor repair.   The tower went down once; I mended it back together and put it up in a hurry.  Is it practical to think about building another pair of trombone elements and buying a longer length of aluminum tubing for a mast.  Or is it possible to buy an element/coax kit and purchasing the mast locally.  Freight on a long mast will be high since it cannot be shipped UPS.

I'll be using either a Motorola MSR 2000 repeater (if I can get the crystals at a reasonable price) or a Motorola GR1225.

TIA