Matching Transformer

[webstar22]

I got one of those St-2 Scantennas. It came with a Matching Transformer from
300ohm to 75ohm. Is there a reason I must use this and could it be causing
my problems. I have bad reception on the UHF channels ie. the EMS 400mhz
range.

Or did I just get a crappy antenna? Should the antenna itself be grounded?

 

[TeRayCodA]

The 300 ohm to 75 ohm matching transformer may be bad.About every year,while I'm thinking about it,I will climb my tower,and change out my transformer(as I have a surplus of them)

Also,it would be difficult to attach 75 ohm coax to the contacts without a transformer,as these are made like a TV antenna.
Try to change out the transformer,I have ran across a bad one before,that was new,off of the shelf.

If that still does not get you the UHF coverage you need,you may need to install your antenna at a different location,away from trees,ect.Be sure it is away from anything metal also.

The antenna integrity should be OK,assuming there is no contact of the elements along the insulator.I suspect a bad contact,or short.

That antenna should work well.
BTW,how far away is the EMS that you are trying to monitor?

And,yes,EVERY antenna outside should be grounded.-not only on the mast,but also at the coax,at the entrance into the house.