[Boatanchors] Repeater antenna on a cold mountain top

[K0DAN]

Take a look at the fiberglass encased colinear antennas such as the 
Stationmaster.
For example: 
http://www.tessco.com/products/displayProductInfo.do?sku=578622&eventPage=1
The fiberglass radome will minimize the effects of wind & ice loading, and 
also protects the interior elements from the weather. At UHF these antennas 
will typically have 6-10dB omni gain, depending on the size of the antenna.
If your QTH is so high, you may want to look into some kind of downtilt 
configuration so that you don't create lobes which shoot right over your 
target coverage area.
Look at some of the major manufacturers/distributors. You can buy an antenna 
custom-made to your frequency and you can also designate what angle of 
downtilt (if any) is needed for your application.
GL es 73
Dan
K0DAN

-----Original Message----- 
From: HL1FB
Sent: November 14, 2013 00:47
To: boatanchors at mailman.qth.net
Subject: [Boatanchors] Repeater antenna on a cold mountain top

We are installing a 70cm repeater on the summit of a 1600meter mountain.

Temperature there goes down to -20 degree centigrade and everything will

frozen covered with ice in winter. Antenna there is also expected to be 
covered with

thick ice. So antenna performance will be poor, I guess.

How poor will the antenna performance be?

My question is what kind of antenna will be suitable for this kind of 
environment.

Any body has experience??
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