The easiest way to do this would be to span a fishing line between the last link-o-loons on both sides of the arch, and then tie the megaloon letters to the fishing line. The megaloons need to be helium filled to make them float. I believe they would hold up the link-o-loons, so you could fill those with air.
Here is a good resource with info and instructions around using link-o-loon balloons.
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I want to send my daughter a Birthday in a Box. The box will be in the cargo area of the plane. Question is will the air inflated balloons pop or deflate?
How to do i make like the number 15 out of a cluster of balloons? ANSWER: Hi Lori and everyone else who asked, In addition to the comments below, please
Hi there, How much should a balloon weight weigh if i wanted to tie 5 balloons to it? ANSWER Hello! I am assuming you are planning to make a centerpiece