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looks to be a common mode filter.

should be put at the feedpoint of the antenna instead of at the radio end.
you can accomplish the same thing with one of those palomar engineers snap on bead kits.
snap them on to the coax right at the feedpoint of your antenna and it will keep common mode currents off of your coax shield.

these currents are pretty much always present in mobile installs due to the strange "counterpoise" the vehicle offers.
LC

[QUOTE="loosecannon, post: 787353, member: 1368"] looks to be a common mode filter. should be put at the feedpoint of the antenna instead of at the radio end. you can accomplish the same thing with one of those palomar engineers snap on bead kits. snap them on to the coax right at the feedpoint of your antenna and it will keep common mode currents off of your coax shield. these currents are pretty much always present in mobile installs due to the strange "counterpoise" the vehicle offers. LC [/QUOTE]

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