LOL! That should be fun seeing how many states you can work with that SDR.
Yes, it is all made of EMT conduit except for the base. You can get that EMT for like $1.92 for a 10 foot section of 1/2". This is a photo of the base of the 40m antenna.
It has a base capacitor made of a piece of 1 1/4" Schedule 40 pipe 9" long. I put two layers of big heat shrink tubing over the base of the vertical radiator and shunk them onto it for an insulator. Then that barely slides into the piece of pipe. And in the bottom of the pipe there is a piece of 1" Schedule 80 PVC tubing that keeps the vertical radiator from sliding in anymore, or shorting out. That piece of PVC is held by a self-tapping screw that goes thru the base and into the PVC. Then I expoxied the top of the vertical element in place with JB-Qwik Weld.
The base capacitor allows me to run a full 33 foot vertical radiator, as the VF of the EMT is about .92. The capacitor cancels the inductance of what would be otherwise be a too-long antenna due to VF in the tubing. So it resonates at 7100 kHz with a full 33 foot radiator. The radiator is made of 1" EMT (1.363" OD) at the base, telescoping up to 1/2" EMT at the top.
The ground plane radials are made of 1/2" EMT with a 3/8" flange nut welded into the end of the tube. There is three 3/8" bolts welded to the 1 1/4" pipe and the ground plane radials screw onto those bolts. They are 10 feet long.
The ring is a shunt transformer that goes from the grounded part of the antenna to the vertical radiator, so the vertical radiator is also DC grounded. By selecting a tap point on the ring, it transforms the impedance to match your feeder. I am feeding it with RG-6 TV coax, 75 ohm. Then I use a 1/12th wavelength section of RG-8 on each end of the RG-6 as transformer matching sections to make the 75 ohm "look" like 50 ohm at both the antenna and transmitter. It tuned 1:1 VSWR at 7100 KHz and is useable without the tuner from 7000-7200 KHz before SWR goes over 1.5. Using the amplifier with tube finals I can run the entire 40m band with it without using the tuner by changing the loading on the amplifier. The amp doesn't care about 3:1 VSWR as long you load and dip it so the finals are happy.
It is way stronger than any aluminum antenna, but it is somewhat heavier. All the telescoped sections of EMT in the vertical radiator are screwed with self-tapping stainless steel screws so the electrical connection between the pieces of the element will never go bad with age.