Quote:
Originally Posted by BostonButterfly
I'm wondering if two separate DB2e's would work just as well (pointed in the directions you mentioned)?
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From what I've learned here, joining two antennas working in the same band (UHF in this case), and aiming them in different directions, will cause the signal being received at a particular frequency through one antenna to be reradiated back out through the other antenna to some degree, resulting in a lower overall effective gain.
The DB2e shows about a 10 dB gain by itself, but combining it through a reversed splitter with another one aimed at 90 degrees would yield something less than 10 dB. The DB8e shows ~10 dB of gain with the two panels at 90 degrees to each other and the signals broadsiding either panel.
So it would seem that to get the same 10 dB of gain, more or less (frequency dependent) as the single bow tie DB2e, but with two primary targets at 90 degrees, you'd need to increase the gain in both directions in order to have enough left over when some is spilled out of the other.
Of course, I'm just thinking out loud, and someone should correct the above as required as I don't want to be spreading bad info, but here's the data sheets for those two antennas. I wish all the manufacturers would publish such sheets.
http://www.antennasdirect.com/cmss_f...s/DB2E-TDS.pdf go to page 2, 0 degree azimuth
https://www.antennasdirect.com/cmss_...s/DB8E-TDS.pdf go to page 5, 45 and 135 degree azimuth