i am with ramanuja who bellowed it aloud to the world.
There is absolutely no evidence that Bhagavat Ramanuja shouted aloud the moola manthram (Thiruvashtaksharam) from the top of the gopuram in Thirukkoshtiyur. This is a popular story, but very unlikely to be true.
First, I do believe Bhagavat Ramanuja was a revolutionary (it is possible with proper leadership) with a great heart -- no wonder Amuthanaar sang காரேய் கருணை இராமானுசா. But, he did not shout out the manthra aloud.
The hagiography of Sri Vaishnava acharyas written the closest to the times of Bhagavat Ramanuja has him going up the gopuram and calling out to everyone to come and that he will show the way to mOksham. Then, inside the temple, in front of the Nrisimhar sannidhi, he explained the hidden meaning of Thiruvashtakshra manthram. Even here, in a smomewhat private setting, he did not say the manthra aloud.
A small and may be unimportant detail perhaps, but here it is, this is what is in the records. How the story got embellished, I really don't know.
Cheers!
p.s. Mahakavi Bharathi translated Gayathri Manthram into a Tamil verse in Panchali Sabadam #153.
செங்கதிர் தேவன் சிறந்த யொளியினைத் தேர்கின்றோம் - அவன்
எங்க ளறிவினை தூண்டி நடத்துக
He had a fetish for sun gazing.