@N4JAW it doesn't make a lot of difference imo, just helps suppress wide signals close to you. You might try QRZ forums, that's how I got mine for around 100 bucks.
@Josefius Oh I've seen them for sale over the years but I guess I'm just use to operating without them since I was first licensed back in the 60's. I've got them on my Ten Tec rigs st the shack and my FT891 buy rarely use it.
I'm very new to Mastodon so here's a short #introduction.
I've been a #hamradio operator since 1988. I have my Extra Class ticket. I currently enjoy #qrp operating and #homebrew projects. Most of my building has been kits but I've come to enjoy scratch building. Not as pretty but a lot of fun.
My latest project has just been powered up, a #T41-EP. Lots to do still but it first picked up a signal today. Looking forward to learning a lot from the community here.