Antenna Separation - new mast project

[wqzw301]

I've been working on this mast design for gmrs repeater and vhf marine radio (possible future vhf repeater)

I think it's a good way of optimizing vertical separation with the antennas i have.

Icom fr-4000 has 3 receiving cans / 2 transmit cans / transmitter isolator/circulator -plus 6 can Motorola tx/rx duplexer 

Future vhf will have same amount of db isolation before it's antenna.

messi 10 pro coax all n connectors

Any constructive thoughts on the plan???

[marcspaz]

If you have a tap and die set, I would add more than the 3 radials to the VHF ground plain to improve performance and help ensure the filters are not overwhelmed. The more radials the better.

[PACNWComms]

Looks good. For the oil industry and many coastal stations, I have made similar setups. Except Sirio antennas were not available as easily in the West Coast of the United States, the local Marine VHF antenna of choice is made by Morad. UHF was then used for a command and control element, and Commscope antennas (DB-404-B), I still call these "paperclip" antennas from my radio youth, have worked very well for a very long time. Great combination there, and you show a very similar antenna stack. Just be sure to use low loss coax and weather sealant tape on the connections and you should get many years of VHF and UHF comms use out of that antenna system. Show pictures once you get it installed, may help show others here, and I am always curious to see myself. 

[gman1971]

Looks good. I like Sirio antennas, they are very very well made. I have a 2-bay WD-140-N dipole, soon to be a 4-bay setup. Best antenna I've owned to date. 

G.

[wqzw301]

Thanks! PACNWCOMMS Great reply made me feel like i'm on the right track.

gman1971 Thanks! Sirio is a great brand - so well designed and constructed.

marcspaz  Thanks! I do and I will. I just have to relocate the set screw holes.

Thanks Lads!