In message ,
writes
joe wrote:
amdx wrote:

On 6/16/2014 10:17 AM, gareth wrote:
What is the availabilty of helium-filled balloons to
haul up a 1/4 wave vertical?



Seem pretty available, I used Google, it is a search engine,
I put in "large helium Balloons" and got 453,000 hits.
Here are a few.

http://www.balloonsfast.com/36inchlatexballoons.html
http://www.balloondealer.com/app/
http://balloons.net/Helium_Balloons/index.php
http://www.partiespluswholesale.com/..._Balloons.html
Mikek


On there other hand, floating a tethered balloon 1/3 mile into the air may
be a problem for airplanes.

Not may, but will, and most countries also regulate such.

In the USA, under Title 14, Part 101 it says that moored ballons may not
operate more than 500 feet above the surface of the earth or within
5 miles of the boundary of any airport.

It further says that moored ballons may not be operated more than 150 feet
above the surface of the earth without 24 hours prior notification to
the nearest FAA ATC facility of all the details of the planned flight.

I doubt the rules are much different anywhere in the 1st world.

The UK certainly used to have a permanent mast height limit of something
like only 40 feet within 2 miles of an airfield. There's also a general
limit on the height of flying kites (unrelated to amateur radio) of
something like 150 or 200 feet (Google required to check).
--
Ian