FYI in response to two recent threads: http://lists.contesting.com/archives//html/Topband/2018-03/msg00139.html http://lists.contesting.com/archives//html/Topband/2018-04/msg00043.html
This plot shows my low inv-V (30m apex is only 0.19 wavelengths) compared to my 3 element parasitic vertical. Study the relative gain vs TOA plots carefully: http://lists.contesting.com/archives//html/Topband/2018-03/msg00139.html My observations over the past 14 years comparing both: 1. The vertical array is best 99% of the time. Usually by ~10 dB to the NE (e.g. EU/W1 from here). From the plots you can see this equates to TOAs (<20 degrees). 2. The inv-V (wires running NNW/SSE) is occasionally (1%of the time) much better to EU or other directions at my local sunset or sunrise. This is striking when it happens and is easy to detect since the inv-V is also better for RX than either Beverages or an RX4SQ. This is clearly some sort of high angle mode around SR/SS and it usually lasts for <30 minutes. 3. The inv-V BW is much broader than the vertical array which is very narrow (~30 kHz). 4. TX antennas are separated by about 100m on different towers and the 30m inv-V height is near optimum for maximum radiation straight up (intentionally). 5. The inv-V also works well to the SE (Caribbean/SA) even without SR/SS enhancement. I have no idea whether how it would behave if rotated 90 degrees since my site doesn't allow for that. Just FYI, Bill W4ZV _________________ Topband Reflector Archives - http://www.contesting.com/_topband