Michael: the radio likely has a 600ohm plus microphone impedance...the 
150ohm pg mike is designed for different applications that require very low 
impedance...the result of using this would be very low audio, no where near 
enough to drive the radio properly.
The SM58 is a 600ohm mike and has really great audio.  I use it on my stuff 
and it has just the right amount of punch in the mids to drive the radio 
nicely, but is round and smooth at the same time.
You might also take a gander at Long and McQuade at the behringer, as well 
as the Sennheiser mikes.
The great thing about using a studio mike for radio is that you can go a bit 
cheaper because you don't need the low end or high end definition often 
lacking in cheaper mikes.
The SM57 is also a fantastic option, in fact, I like it a bit better than 
the sm58 for speech applications.
It has a smoother punchier sound than even the sm58, which was designed for 
singing.
The sm57 is commonly used in high end recorded or broadcast speech 
applications...like the White House press room for instance.
Just put a foam pop filter over the 57 as it can get a bit poppy...but I 
even like the feel/look of the 57 more than the bulbis fat head of the sm58.
The sm57 is also more directional than the 58, so you will get less ambient 
noise on your transmitions and the audio is more focused because of the 
directional nature of the mikes pickup pattern.
The sm58 was designed so that a singer could be off axes a bit and still be 
picked up, so the kartioid pattern is much wider.
Either way, the 58 or 57 are really good options for radio communications 
audio.
Funny, since both mikes are now almost 60 years old, yet are still commonly 
used in live and studio settings.  Many of your favorite songs used sm57's 
on guitar bass and drums, and sm58's on the vocal track.


Regards
Colin
-----Original Message----- 
From: Michael Ryan
Sent: Saturday, November 14, 2015 12:36 PM
To: [log in to unmask]
Subject: Shure SM-58

Another mic I'm considering is the SM-58.
I'm not sure how I can attach spec sheets so that those on the list can
review them with me so you can find them on the shure.com site and again
the 2 mics are the PG Alta 58 and the SM-58. Both sell for 99 bucks here in 
NL.

73:
Mike DE VO1AX

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