Antenna placement

DjMtrx3 · Post by **DjMtrx3** » Sun Feb 29, 2004 9:51 am

Quick question and I figured this would be the place to ask with the people that know there stuff. I have a NMO mount UHF antenna on my Ford E-150 as of right now right about the dome light. I want to add an 800 MHz antenna also a NMO mount. How far should they be separated on the roof? I was looking around the internet and saw things like 14 inches and 22 inches, but what would you guys suggest? Thanks

Alex

KG6EAQ · Post by **KG6EAQ** » Sun Feb 29, 2004 10:46 am

As long as it's more than 6" I wouldn't worry about it. The safe measurement is at least 1/4 wave on the lower frequency antenna. If you can space it out more go for it.

wa2zdy · Post by **wa2zdy** » Sun Feb 29, 2004 7:45 pm

Yep, the quarter wave at the lowest frequency is the correct number to avoid interaction between the antennas. That doesn't mean two UHF antennas can be 6 inches apart without receiver desense, just that the two antennas will not screw up each other's radiation patterns and SWR.