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Yeah, ageed, however most of the receiving gear can be purchased 'off the shelf' Especially the UHF equipment (definitely not for novice constructers).
Things like Helix antennas and/or stacked arrays are really not that complex to build.
The theory can be a bit involved, but who needs to understand the whichness of the why? I'm convinced that 99.9% of TV antenna installers are totally clueless about how the product they install works. But as long as they leave the 4:1 balun in their pockets, there is not too much to go wrong.
In the scan of helix antenna formulas that I posted just remember that the upside down 'Y' thingy (Lamda) represents the wavelength which is 300 divided by the frequency(in mhz)
Don't be discouraged by schematics they are mostly beyond all but the very best home constructors.
There are some specialised receivers for Radio Astronomy that plug into pc's but I have no links on hand, but can get them if I ask the right people.
Go with your 15M receiver and open loop and see if you want to progress.
best,
Doug
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