I waited long enough now, that this has email has been ignored. I just want to share this here as most of you could care less about radio frequencies, there are some of us that do. And even if you don't you should be concerned the paying USAC customers are ignored.
Okay let the bashing of me begin.
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This is a copy of the following message you sent to Contacts via USAC Racing on July 18, 2015.

This is an enquiry email via http://usacracing.com/ from:
<indy1808@yahoo.com>

Greetings,
I have been a member of this Club for years and have always used RE 1way to listen to all the extra info on the events i.e.. Provisionals, scratches, driver condition from wrecks & aftermath, format changes and etc.
I keep records and score everything. This only serves to enhance my experience with the sanction.
Before you say get it from the announcer, you should know MANY times the PA can not be heard or it is easy to miss with people talking etc. in the stands
I have spent lots of hard earned money with RE to do this and now all I get is the one way to Drivers on track. Please inform me of how to get the new channel or what those frequencies might be. I only want what is best for the Club to endure.
My sincere regards,
R

Have you tried these:

• 464.550
• 461.6375
• 151.625

You would probably have more luck sending an email to a specific person at USAC vs. a generic email.

Yes.
I've scanned all season long, as have others, pretty sure they are scrambling except driver to race control. Others have asked officials in person. I have listened for years on their channels. Guessing the "Club" is gone by the wayside. So now other than a few decals (i used to get a rule book and other promo items) and a one time 10% discount at the merch trailer, guess I'm not too smart being a member if they cant even trust me with their Frequencies?

Try this a push truck driver was nice enough to drive into the pits from the infield at THAT and bring this back to me 459.3125 its what you are looking for.

Chuck