I put up an Inverted-V on my 30m tower in January 2004 in order to have a "high-angle" antenna for those cases when we have that type of propagation. The blue plot below shows the elevation pattern. It turns out that 30m is about the optimum height to maximize radiation straight up (7.14 dBi at 90 degrees), which was my goal for this antenna.
I've also been experimenting with converting my 55m shunt-fed tower to a 3-element parasitic array. This antenna is a combination of ideas from W1FV, K1VR, W2GD and K2TW. The FVR-Sptifire Array (RW2F uses one of these) which was developed by W1FV and K1VR, uses parasitic dipoles on either side of a shunt-fed tower. Instead of using the sloping dipole configuration, I used lazy-V dipoles. I got this idea from W2GD and K2TW who use dipoles like these as driven elements on either side of a Delta loop reflector for their CQ 160 contest location at the Coast Guard Station at Sandy Hook, NJ. In my case, the tower is the driven element and the lazy-V's are the director and reflector. I suppose I'll christen this antenna the LaZV! :-)) The elevation pattern is shown above in black and the physical configuration is shown in the drawing below. This is what the system would look like if I go to a full 4-element version. Only 2 parasitics (director & reflector) would be in use at any time, with the two orthogonal elements shorted to ground. So far, this antenna is fixed to the Northeast with only a fixed director and reflector, but I may convert it to a switchable 4-direction system if I conclude it is working well (and if my neighbor allows me to put one support in his cow pasture!).
So far it has been very interesting to compare these two antennas. I continue to be surprised at how well the Inverted-V works. If you study the elevation plots above, you can see that it should be better for takeoff angles of 40 degrees and above. The Inverted-V seems to work especially well at sunrise and sunset (sometimes), but it even works well in total darkness on some days when conditions favor high takeoff angles.
While I'm into EZNEC and Front Page, here are plots of a pair of phased staggered 1115' Beverages aimed at 50 degrees which I put up in January. My main goal in doing this was to reject QRN (and QRM) from the Southwest quadrant. The Receiving Directivity Factor (RDF) for this antenna is 14.1 dB.
I thought some might be interested in seeing these...the transmit antenna is still very much a work in progress.