If I wanted to put up a J-pole antenna permanently, what is a good way
to support it?  Is this design tolerant of nearby metal (like masts,
twin lead supports, etc)?  Could I do the below and not mess the antenna up?
 
                        _____
        !______________/     \
        !               _____/  support grabbing onto plastic with wires
        !                       removed about a foot above wire ends
        !
        ! 
        !               |   | do not short this end.
        !               |   | (when trimming for vswr, cut both sides)
        !               |   |
   metal mast           |   |
        !               |   |
        !           3/4 |   |        Technically-speaking, this is a 1/2
        !          wave |   |        wave end-fed antenna with a 1/4 wave
        !               |   |        matching section.
        !               |   |
        !               |     1/4" gap
        !<- 3 to 5"---->|   |         (trim for vswr _below_ gap)
        !               |   | 1/4
        !              _|   |_wave
        !_____________/ |   | \
    coax ctr conductor=>*   *<= coax shield
        !        1 1/4"-|   |
        !                -*-    solder the twin leads together at bottom
        !
another support grabbing ribbon at the point where the coax connects
        !

I strongly suspect that the above will have problems, especially the metal
mast being only a few inches away from the antenna.  The top support is
grabbing onto the ribbon with the wires trimmed away about a foot above
the top ends of the antenna wires.  This should keep that support from
severely messing up the top.  Maybe use a good stiff plastic mast
instead of metal?  PVC?  I would guess that I can use a twin lead support
to hold the antenna where the coax connects, and get away with it.  Even
tape the coax to it.  

What say, antenna experts?