Okay, let me take a shot at this.
PaulTB said:
メディアに関わっていると目され、実名でブログを持つ方がここ1、2ヶ月の間に続出している。
This journalist, in the spotlight for for his media involvement, wrote a blog under his real name for about a couple of months.
Is 方 a _single_ specific person here?
Highly unlikely, especially given that your final predicate is 続出する, which describes a similar event/happening that occurs repeatedly. Also, I think "in the spotlight" might be a bit too strong of an interpretation -- I'd go with simply "seen as", or something along those lines. But your biggest problem here is that 「メディアに関わっていると目され、実名でブログを持つ」 is a giant relative clause that's modifying 「方」, which in turn is the subject of 「続出している」, something that seems to get lost in your translation.
Try something like "Individuals who are recognized members of the media and also run blogs under their real names have been popping up one after another over the past one or two months."
PaulTB said:
雑誌が主な舞台らしい方で複数人でブログを持つ例もあり、私が見た名前の数だけで20を超える。There are a fair few people with blogs written by multiple people in a mainly magazine like setting, I know of more than 20 such myself.
The bit around "mainly magazine like setting" I'm particularly uncertain of.
You're confusing another relative clause here. 「雑誌が主な舞台らしい」 is modifying 「方」, meaning "people for whom it appears that magazines are their main 'stage'".
"One also finds examples of blogs run by multiple individuals who mainly are active on the magazine scene. I've seen more than twenty such names myself." would probably work.
PaulTB said:
雑誌がもし編集部公認でブログを出せるなら、アンテナショップを出す感覚で大胆にネット上の反応を見るといった試みがあってもよいが、コンテンツを持ち出すのに迷いがある。
It would be great if there were examples of magazines putting out blogs with approval of the editorial department like putting out an 'antenna shop'*1 to see the reaction on the net but they usually waver what to include.
The bit around アンテナショップを出す感覚で大胆にネット上の反応を見るといった試みがあってもよい I'm uncertain of.
"It would be great" sounds a little too enthusiastic to me.
"If a magazine is able to put out a blog with the approval of their editorial department, it's fine to do so as an attempt to gauge reaction on the net -- in the same sense of a store opening an 'antenna shop' -- but there is some hesitation to put the contents of their publication up on the net.
*1 shops that specialise in trial goods and experimental lines.
I think you're missing the most important nuance of this expression (and I'm not sure where you got "experimental lines" from.) Go back and look at the
dictionary entry one more time. The "antenna shop" is a shop opened for the specific purpose of selling new products in order to gauge consumer reaction to them.
I'm assuming that there's some business-world jargon for this some concept in English as well, but I wouldn't have the slightest clue what it would be. This is why I'm not a professional translator, I guess.
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I'm not particularly confident in the smoothness of my English translations (I wrote them kind of quickly), but I feel relatively certain about my interpretation(s) of the original text. Hopefully this will help clear up any confusing points. (If I've made any mistakes of my own, I'm hoping that epigeneさん or any of the other more experienced people here will jump in to correct me.)