This is a good point. My setup is really ghetto right now (the antenna standing on the side of my pool). I'm planning to put an antenna on the roof but none of my GPS antenna are working with my Rohde & Schwarz ED170MP. The ED170MP is supplying 15V but my antenna only goes to 5V max. So I tried supplying 5V externally with a biastee but look like the ED170MP doesn't like that. I need to contact Meinberg (the producer of the ED170MP) to see if they can recommend an antenna.
The Meinberg receivers typically have a fairly advanced antenna, in which they downmix the received signal to ~300MHz and ship that over the RG58 for quite some length; IIRC you can go to just below 100m, but that's from memory and not from readily available manuals
![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif.pagespeed.ce._hfWAz_QHO.gif)
. If you
wishneed to cross a TEMPEST or EMP barrier or simply are far away from a good antenna position they've got a optical fibre interface too. Multimode
![Sad :(](https://www.eevblog.com/forum/Smileys/default/xsad.gif.pagespeed.ic.L3FGyzQrjB.png)
of course. (my position is that friends do not let friends install multimode cabling. It is a duty of honour to keep the world free from the echo-chambers of the optical industry.)
This means that a Meinberg family receiver typically expects down-mixed input and will frown at the output of a normal GPS antenna.
Do note that I've never worked with the OEM modules sold to others, but only with the systems receivers used for NTP, PTP and other timing supply systems. They might have thought differently for some or all of their OEM customers.
Finally, do get in touch with the people at Meinberg. They are one of the most accessible companies in the TE world, and in my repeated experience they will go the extra mile in supporting their devices and helping you.