In the past 35+ years that I have worked in broadcasting, we have connected Heliax directly to antennas wherever possible. This includes 3/8, ½, 7/8, 1 ¼, 1 5/8 (3/8 Heliax is generally used as sampling lines for AM directional arrays). Foam or pressurized air line versions. 1 5/8, 3 1/8 & 4 1/8 Heliax usually employs EIA Flange connectors although 1 5/8 is widely used with D connector terminations in relatively low power modes. I have never encountered or heard of Heliax cracking. When properly installed and supported with attention to minimum bend radius a direct connection should last a loong time something we are picky about in the broadcast industry. The only Heliax failures I have experienced were with clients that had bullet holes usually air line for high powered FM stations. Reasons to go with Heliax every time (regardless of length): 100% shielding no equivocating here Almost unlimited life expectancy Stability undamaged 30 year old Heliax will test as good as new Economy in the long run it will be cheaper Lowest possible loss TX & RX My two cents. I dont own any Andrew stock! Don Kerouac K9NR Midwest Broadcast Services, Inc.
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