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Would anyone care to divulge the tx frequency or is this a secret?

You mean the Boeing Flight Test and ramp freqs?

Everett Plant uses 123.475 Mhz
Renton Plant uses 123.350 Mhz

"Boeing Seattle" can use any of several freqs from several sites.

123.225 Mhz and 123.275 Mhz have been used for the Wedgetail and Possideon military program testing.
Often the aircraft use Magpie-xxx callsigns.

123.325 Mhz has been used for the 787 and 747-8 test flights.

123.425 Mhz is used for Boeing Seattle ramp and other coms.

Kerwin

Tnx Kerwin, I was wondering what the 747-8F was using yesterday. I heard them pop on a couple times on 123.325, so either I missed the take off and they were too far east or I couldn't find where they were.

The majority of the chatter from 11am-2pm was flight testing RC-501. They flew a circle pattern then headed south to Astoria and then back. Nice to be at 2700 ft. with a clear view south. I had good reception the entire time.

That frequency is the Seattle/NBF "In Air" frequency. The ramp freq at Seattle is 123.55!