That is precisely what it was, an OTH backscatter array. The transmitter was located about 70 km from this receiving array so it wouldn't cause any desense issues.
Posted 11 March 2019 - 08:23 AM
If you are talking about stacking one antenna atop the other to get 3-db of additional gain, it requires a new factory phasing harness.
If you plan on mounting them otherwise, you would be better to us a voter and a second receiver for phase diversity on receive and can gain 6-db or more on RX.
If you are using a duplexer and the antennas are phased incorrectly (harness and/or spacing); it can create some bad TX patterns including rapid fading for mobiles.
One of the advantages of using a voter is you can add a high gain preamp (may require a bandpass filter also) and greatly improve handheld coverage.
Posted 17 March 2019 - 11:52 AM
Going forward with one single DB420 and 220 feet of 1 5/8 heliax cable. Just told by tower owner that is all free for me to use. So I can't bit*h to much.
Trade off is I buy, install, service, and maintain a standby generator. It is on it's way. Be here next week.
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