Your frigging funny! the noise we are talking about is generated in the radio's front end itself, not on the antenna. If you take the radio off line without any antenna connected it has noise, what ever you want to call it, internal white noise, hiss the radio has its own internal noise even when used with headphones and allot of entry Icom radio's have the same issues just like the older Yaesu did but that was there audio amp's in the older radio's, even the crowned K3 has the same thing which when you place an antenna back onto the rig it gets even worse.
Maybe me think there is allot more high frequency deaf hams out there that just don't hear that well into the higher audio spectrum and I mean right around the 10K mark.
BTW the current discounts on the 3000 bring the differences between the Icom to Yaesu around $400 not $900 plus the used market on the 3K is almost a wash, I have seen the 3K's go used for around $1400.
Ask your buddies in EU about the 7300 handling any big signals on its input side, once that DAC gets swamped even the IP+ button doesn't bring it back. I have a ham friend who lives on the south shore of LI 1.5 miles away from a local AM station that transmits on 1500Khz, he has a 160 meter dipole up and cannot use that radio on that band at all yet has a 20 year old FT1000MP which has zero issues on that band.
As to K6AER those of us who have used the radio have used all the controls which should make these differences including adjusting the attenuator, RF gain controls plus the IP+, you guys on the west coast thing us east coast guys were born yesterday.
Again its a great $1300 radio, I never said its not but depending on were you live and how many other hams that may live close to you it may not be the best cup of tea for your station and comparing the 7300 to the Yaesu 857 which was mostly a mobile radio designed to give you many bands in one little box like Icoms 706 well that type of radio is like having 10 pounds of crap in a 3 pound box, its just way too much and not designed to be particularly good at anything. The 7300 from looking at the low end of the price spectrum is a shinning star but its not there IC7851 in a smaller box for $1300 nor is it better than the FTDX3000 IMHO but from what seems to sell radio's today it has a very pretty fish finder display which seems to what folks want in a radio today. I must be old school I want a better front end in my radio's to handle more than a rag chew operation.