What I meant was it would have been a better choice to put up a antenna cut for the airband frequencies instead of feeding the discone with good coax since the discone is a "so called all band antenna"
witch performs poorly IE: not optimized at any frequency
However if your using the discone for the other scanners in the house and don't want to put up more antennas and coax this would be a good choice for you
Now with this kind of setup in mind since you are using 100ft of coax and then splitting it two ways may I suggest a good quality Active Multicoupler ?
This would help in the now huge amount of loss you will suffer no matter what kind of coax you use specialty in the UHF range !
Here is what I would recommend Active Multicoupler Model MCA202M this will give you no loss at splitting and in fact a Gain of +4 dB if you need more then 2 ports there are other models
http://www.stridsberg.com/prod01.htmThe down side to this kind of set up it comes at a
high price tag but it will save you from putting up more antennas and running more coax
It is my hope I did not discourage you but in fact helped you along the way to success
Glenn KB6HLM
http://audio.liveatc.net:8012/klas.m3uPS
BTW I am thinking about setting up something like that myself since I have 5 scanners running all at the same time witch requires 5 antennas !
1 discone 1 coax 1 Active Multicoupler maybe thats not a bad idea ?? the only thing I did not like about the Multicoupler it stops at 1Ghz and 2 of my scanners can go up to 3Ghz but I could make a nice antenna just for the 1Ghz to 3Ghz range witch is outside of the discone range anyway !
What I may end up with is a
Custom tuned 5/8 wave Aircraft Band Antenna using a Muticoupler for 2 of the scanners that FEED LiveATC APP/DEP on one and TWR/DEL on the outer and then other scanners using the discone
Here is the antenna I am thinking about buying for the feeds LARSEN SUPER BASE
http://wingsandwheels.com/page14.htmO the fun goes on and on